Tender Annular Plaque on the Thigh

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Tender Annular Plaque on the Thigh

The Diagnosis: Ecthyma Gangrenosum

Histopathology revealed basophilic bacterial rods around necrotic vessels with thrombosis and edema (Figure). Blood and tissue cultures grew Pseudomonas aeruginosa. Based on the histopathology and clinical presentation, a diagnosis of P aeruginosa–associated ecthyma gangrenosum (EG) was made. The patient’s symptoms resolved with intravenous cefepime, and he later was transitioned to oral levofloxacin for outpatient treatment.

Histopathology showed basophilic bacterial rods around necrotic vessels (arrows) with thrombosis and edema (H&E, original magnification ×200).

Ecthyma gangrenosum is an uncommon cutaneous manifestation of bacteremia that most commonly occurs secondary to P aeruginosa in immunocompromised patients, particularly patients with severe neutropenia in the setting of recent chemotherapy.1,2 Ecthyma gangrenosum can occur anywhere on the body, predominantly in moist areas such as the axillae and groin; the arms and legs, such as in our patient, as well as the trunk and face also may be involved.3 Other causes of EG skin lesions include methicillin-resistant Staphylococcus aureus, Citrobacter freundii, Escherichia coli, fungi such as Candida, and viruses such as herpes simplex virus.2,4-6 Common predisposing conditions associated with EG include neutropenia, leukemia, HIV, diabetes mellitus, extensive burn wounds, and a history of immunosuppressive medications. It also has been known to occur in otherwise healthy, immunocompetent individuals with no difference in clinical manifestation.2

The diagnosis is clinicopathologic, with initial evaluation including blood and wound cultures as well as a complete blood cell count once EG is suspected. An excisional or punch biopsy is performed for confirmation, showing many gram-negative, rod-shaped bacteria in cases of pseudomonal EG.7 Histopathology is characterized by bacterial perivascular invasion that then leads to secondary arteriole thrombosis, tissue edema, and separation of the epidermis.7,8 Resultant ischemic necrosis results in the classic macroscopic appearance of an erythematous macule that rapidly progresses into a central necrotic lesion surrounded by an erythematous or violaceous halo after undergoing a hemorrhagic bullous stage.1,9 A Wood lamp can be used to expedite the diagnosis, as Pseudomonas bacteria excretes a pigment (pyoverdine) that fluoresces yellowish green.10

Ecthyma gangrenosum can be classified as a primary skin lesion that may or may not be followed by bacteremia or as a lesion secondary to pseudomonal bacteremia.11 Bacteremia has been reported in half of cases, with hematogenous metastasis of the infection, likely in manifestations with multiple bilateral lesions.2 Our patient’s presentation of a single lesion revealed a positive blood culture result. Lesions also can develop by direct inoculation of the epidermis causing local destruction of the surrounding tissue. The nonbacteremic form of EG has been associated with a lower mortality rate of around 15% compared to patients with bacteremia ranging from 38% to 96%.12 The presence of neutropenia is the most important prognostic factor for mortality at the time of diagnosis.13

Prompt empiric therapy should be initiated after obtaining wound and blood cultures in those with infection until the causative organism and its susceptibility are identified. Pseudomonal infections account for 4% of all cases of hospital-acquired bacteremia and are the third leading cause of gram-negative bloodstream infection.7 Initial broad-spectrum antibiotics include antipseudomonal β-lactams (piperacillin-tazobactam), cephalosporins (cefepime), fluoroquinolones (levofloxacin), and carbapenems (imipenem).1,7 Medical therapy alone may be sufficient without requiring extensive surgical debridement to remove necrotic tissue in some patients. Surgical debridement usually is warranted for lesions larger than 10 cm in diameter.3 Our patient was treated with intravenous cefepime with resolution and was followed with outpatient oral levofloxacin as appropriate. A high index of suspicion should be maintained for relapsing pseudomonal EG infection among patients with AIDS, as the reported recurrence rate is 57%.14

Clinically, the differential diagnosis of EG presenting in immunocompromised patients or individuals with underlying malignancy includes pyoderma gangrenosum, papulonecrotic tuberculid, and leukemia cutis. An erythematous rash with central necrosis presenting in a patient with systemic symptoms is pathognomonic for erythema migrans and should be considered as a diagnostic possibility in areas endemic for Lyme disease in the United States, including the northeastern, mid-Atlantic, and north-central regions.15 A thorough history, physical examination, basic laboratory studies, and histopathology are critical to differentiate between these entities with similar macroscopic features. Pyoderma gangrenosum histologically manifests as a noninfectious, deep, suppurative folliculitis with leukocytoclastic vasculitis in 40% of cases.16 Although papulonecrotic tuberculid can present with dermal necrosis resulting from a hypersensitivity reaction to antigenic components of mycobacteria, there typically are granulomatous infiltrates present and a lack of observed organisms on histopathology.17 Although leukemia cutis infrequently occurs in patients diagnosed with leukemia, its salient features on pathology are nodular or diffuse infiltrates of leukemic cells in the dermis and subcutis with a high nuclear-to-cytoplasmic ratio, often with prominent nucleoli.18 Lyme disease can present in various ways; however, cutaneous involvement in the primary lesion is histologically characterized by a perivascular lymphohistiocytic infiltrate containing plasma cells at the periphery of the expanding annular lesion and eosinophils present at the center.19

References
  1. Abdou A, Hassam B. Ecthyma gangrenosum [in French]. Pan Afr Med J. 2018;30:95. doi:10.11604/pamj.2018.30.95.6244
  2. Vaiman M, Lazarovitch T, Heller L, et al. Ecthyma gangrenosum and ecthyma-like lesions: review article. Eur J Clin Microbiol Infect Dis. 2015;34:633-639. doi:10.1007/s10096-014-2277-6
  3. Vaiman M, Lasarovitch T, Heller L, et al. Ecthyma gangrenosum versus ecthyma-like lesions: should we separate these conditions? Acta Dermatovenerol Alp Pannonica Adriat. 2015;24:69-72. doi:10.15570 /actaapa.2015.18
  4. Reich HL, Williams Fadeyi D, Naik NS, et al. Nonpseudomonal ecthyma gangrenosum. J Am Acad Dermatol. 2004;50(5 suppl): S114-S117. doi:10.1016/j.jaad.2003.09.019
  5. Hawkley T, Chang D, Pollard W, et al. Ecthyma gangrenosum caused by Citrobacter freundii [published online July 27, 2017]. BMJ Case Rep. doi:10.1136/bcr-2017-220996
  6. Santhaseelan RG, Muralidhar V. Non-pseudomonal ecthyma gangrenosum caused by methicillin-resistant Staphylococcus aureus (MRSA) in a chronic alcoholic patient [published online August 3, 2017]. BMJ Case Rep. doi:10.1136/bcr-2017-220983m
  7. Bassetti M, Vena A, Croxatto A, et al. How to manage Pseudomonas aeruginosa infections [published online May 29, 2018]. Drugs Context. 2018;7:212527. doi:10.7573/dic.212527
  8. Llamas-Velasco M, Alegría V, Santos-Briz Á, et al. Occlusive nonvasculitic vasculopathy. Am J Dermatopathol. 2017;39:637-662. doi:10.1097/DAD.0000000000000766
  9. Sarkar S, Patra AK, Mondal M. Ecthyma gangrenosum in the periorbital region in a previously healthy immunocompetent woman without bacteremia. Indian Dermatol Online J. 2016;7:36-39. doi:10.4103/2229-5178.174326
  10. Ponka D, Baddar F. Wood lamp examination. Can Fam Physician. 2012;58:976.
  11. Van den Broek PJ, Van der Meer JWM, Kunst MW. The pathogenesis of ecthyma gangrenosum. J Infect. 1979;1:263-267. doi:10.1016 /S0163-4453(79)91329-X
  12. Downey DM, O’Bryan MC, Burdette SD, et al. Ecthyma gangrenosum in a patient with toxic epidermal necrolysis. J Burn Care Res. 2007;28:198-202. doi:10.1097/BCR.0B013E31802CA481
  13. Martínez-Longoria CA, Rosales-Solis GM, Ocampo-Garza J, et al. Ecthyma gangrenosum: a report of eight cases. An Bras Dermatol. 2017;92:698-700. doi:10.1590/abd1806-4841.20175580
  14. Khan MO, Montecalvo MA, Davis I, et al. Ecthyma gangrenosum in patients with acquired immunodeficiency syndrome. Cutis. 2000;66:121-123.
  15. Nadelman RB, Wormser GP. Lyme borreliosis. Lancet. 1998; 352:557-565.
  16. Su WP, Schroeter AL, Perry HO, et al. Histopathologic and immunopathologic study of pyoderma gangrenosum. J Cutan Pathol. 1986;13:323-330. doi:10.1111/j.1600-0560.1986.tb00466.x
  17. Tirumalae R, Yeliur IK, Antony M, et al. Papulonecrotic tuberculidclinicopathologic and molecular features of 12 Indian patients. Dermatol Pract Concept. 2014;4:17-22. doi:10.5826/dpc.0402a03
  18. Obiozor C, Ganguly S, Fraga GR. Leukemia cutis with lymphoglandular bodies: a clue to acute lymphoblastic leukemia cutis [published online August 15, 2015]. Dermatol Online J. 2015;21:13030/qt6m18g35f
  19. Vasudevan B, Chatterjee M. Lyme borreliosis and skin. Indian J Dermatol. 2013;58:167-174. doi:10.4103/0019-5154.110822
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From the Division of Dermatology, University of Kansas Medical Center, Kansas City.

The authors report no conflict of interest.

Correspondence: Spyros M. Siscos, MD, Division of Dermatology, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160 (ssiscos@kumc.edu).

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From the Division of Dermatology, University of Kansas Medical Center, Kansas City.

The authors report no conflict of interest.

Correspondence: Spyros M. Siscos, MD, Division of Dermatology, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160 (ssiscos@kumc.edu).

Author and Disclosure Information

From the Division of Dermatology, University of Kansas Medical Center, Kansas City.

The authors report no conflict of interest.

Correspondence: Spyros M. Siscos, MD, Division of Dermatology, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160 (ssiscos@kumc.edu).

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The Diagnosis: Ecthyma Gangrenosum

Histopathology revealed basophilic bacterial rods around necrotic vessels with thrombosis and edema (Figure). Blood and tissue cultures grew Pseudomonas aeruginosa. Based on the histopathology and clinical presentation, a diagnosis of P aeruginosa–associated ecthyma gangrenosum (EG) was made. The patient’s symptoms resolved with intravenous cefepime, and he later was transitioned to oral levofloxacin for outpatient treatment.

Histopathology showed basophilic bacterial rods around necrotic vessels (arrows) with thrombosis and edema (H&E, original magnification ×200).

Ecthyma gangrenosum is an uncommon cutaneous manifestation of bacteremia that most commonly occurs secondary to P aeruginosa in immunocompromised patients, particularly patients with severe neutropenia in the setting of recent chemotherapy.1,2 Ecthyma gangrenosum can occur anywhere on the body, predominantly in moist areas such as the axillae and groin; the arms and legs, such as in our patient, as well as the trunk and face also may be involved.3 Other causes of EG skin lesions include methicillin-resistant Staphylococcus aureus, Citrobacter freundii, Escherichia coli, fungi such as Candida, and viruses such as herpes simplex virus.2,4-6 Common predisposing conditions associated with EG include neutropenia, leukemia, HIV, diabetes mellitus, extensive burn wounds, and a history of immunosuppressive medications. It also has been known to occur in otherwise healthy, immunocompetent individuals with no difference in clinical manifestation.2

The diagnosis is clinicopathologic, with initial evaluation including blood and wound cultures as well as a complete blood cell count once EG is suspected. An excisional or punch biopsy is performed for confirmation, showing many gram-negative, rod-shaped bacteria in cases of pseudomonal EG.7 Histopathology is characterized by bacterial perivascular invasion that then leads to secondary arteriole thrombosis, tissue edema, and separation of the epidermis.7,8 Resultant ischemic necrosis results in the classic macroscopic appearance of an erythematous macule that rapidly progresses into a central necrotic lesion surrounded by an erythematous or violaceous halo after undergoing a hemorrhagic bullous stage.1,9 A Wood lamp can be used to expedite the diagnosis, as Pseudomonas bacteria excretes a pigment (pyoverdine) that fluoresces yellowish green.10

Ecthyma gangrenosum can be classified as a primary skin lesion that may or may not be followed by bacteremia or as a lesion secondary to pseudomonal bacteremia.11 Bacteremia has been reported in half of cases, with hematogenous metastasis of the infection, likely in manifestations with multiple bilateral lesions.2 Our patient’s presentation of a single lesion revealed a positive blood culture result. Lesions also can develop by direct inoculation of the epidermis causing local destruction of the surrounding tissue. The nonbacteremic form of EG has been associated with a lower mortality rate of around 15% compared to patients with bacteremia ranging from 38% to 96%.12 The presence of neutropenia is the most important prognostic factor for mortality at the time of diagnosis.13

Prompt empiric therapy should be initiated after obtaining wound and blood cultures in those with infection until the causative organism and its susceptibility are identified. Pseudomonal infections account for 4% of all cases of hospital-acquired bacteremia and are the third leading cause of gram-negative bloodstream infection.7 Initial broad-spectrum antibiotics include antipseudomonal β-lactams (piperacillin-tazobactam), cephalosporins (cefepime), fluoroquinolones (levofloxacin), and carbapenems (imipenem).1,7 Medical therapy alone may be sufficient without requiring extensive surgical debridement to remove necrotic tissue in some patients. Surgical debridement usually is warranted for lesions larger than 10 cm in diameter.3 Our patient was treated with intravenous cefepime with resolution and was followed with outpatient oral levofloxacin as appropriate. A high index of suspicion should be maintained for relapsing pseudomonal EG infection among patients with AIDS, as the reported recurrence rate is 57%.14

Clinically, the differential diagnosis of EG presenting in immunocompromised patients or individuals with underlying malignancy includes pyoderma gangrenosum, papulonecrotic tuberculid, and leukemia cutis. An erythematous rash with central necrosis presenting in a patient with systemic symptoms is pathognomonic for erythema migrans and should be considered as a diagnostic possibility in areas endemic for Lyme disease in the United States, including the northeastern, mid-Atlantic, and north-central regions.15 A thorough history, physical examination, basic laboratory studies, and histopathology are critical to differentiate between these entities with similar macroscopic features. Pyoderma gangrenosum histologically manifests as a noninfectious, deep, suppurative folliculitis with leukocytoclastic vasculitis in 40% of cases.16 Although papulonecrotic tuberculid can present with dermal necrosis resulting from a hypersensitivity reaction to antigenic components of mycobacteria, there typically are granulomatous infiltrates present and a lack of observed organisms on histopathology.17 Although leukemia cutis infrequently occurs in patients diagnosed with leukemia, its salient features on pathology are nodular or diffuse infiltrates of leukemic cells in the dermis and subcutis with a high nuclear-to-cytoplasmic ratio, often with prominent nucleoli.18 Lyme disease can present in various ways; however, cutaneous involvement in the primary lesion is histologically characterized by a perivascular lymphohistiocytic infiltrate containing plasma cells at the periphery of the expanding annular lesion and eosinophils present at the center.19

The Diagnosis: Ecthyma Gangrenosum

Histopathology revealed basophilic bacterial rods around necrotic vessels with thrombosis and edema (Figure). Blood and tissue cultures grew Pseudomonas aeruginosa. Based on the histopathology and clinical presentation, a diagnosis of P aeruginosa–associated ecthyma gangrenosum (EG) was made. The patient’s symptoms resolved with intravenous cefepime, and he later was transitioned to oral levofloxacin for outpatient treatment.

Histopathology showed basophilic bacterial rods around necrotic vessels (arrows) with thrombosis and edema (H&E, original magnification ×200).

Ecthyma gangrenosum is an uncommon cutaneous manifestation of bacteremia that most commonly occurs secondary to P aeruginosa in immunocompromised patients, particularly patients with severe neutropenia in the setting of recent chemotherapy.1,2 Ecthyma gangrenosum can occur anywhere on the body, predominantly in moist areas such as the axillae and groin; the arms and legs, such as in our patient, as well as the trunk and face also may be involved.3 Other causes of EG skin lesions include methicillin-resistant Staphylococcus aureus, Citrobacter freundii, Escherichia coli, fungi such as Candida, and viruses such as herpes simplex virus.2,4-6 Common predisposing conditions associated with EG include neutropenia, leukemia, HIV, diabetes mellitus, extensive burn wounds, and a history of immunosuppressive medications. It also has been known to occur in otherwise healthy, immunocompetent individuals with no difference in clinical manifestation.2

The diagnosis is clinicopathologic, with initial evaluation including blood and wound cultures as well as a complete blood cell count once EG is suspected. An excisional or punch biopsy is performed for confirmation, showing many gram-negative, rod-shaped bacteria in cases of pseudomonal EG.7 Histopathology is characterized by bacterial perivascular invasion that then leads to secondary arteriole thrombosis, tissue edema, and separation of the epidermis.7,8 Resultant ischemic necrosis results in the classic macroscopic appearance of an erythematous macule that rapidly progresses into a central necrotic lesion surrounded by an erythematous or violaceous halo after undergoing a hemorrhagic bullous stage.1,9 A Wood lamp can be used to expedite the diagnosis, as Pseudomonas bacteria excretes a pigment (pyoverdine) that fluoresces yellowish green.10

Ecthyma gangrenosum can be classified as a primary skin lesion that may or may not be followed by bacteremia or as a lesion secondary to pseudomonal bacteremia.11 Bacteremia has been reported in half of cases, with hematogenous metastasis of the infection, likely in manifestations with multiple bilateral lesions.2 Our patient’s presentation of a single lesion revealed a positive blood culture result. Lesions also can develop by direct inoculation of the epidermis causing local destruction of the surrounding tissue. The nonbacteremic form of EG has been associated with a lower mortality rate of around 15% compared to patients with bacteremia ranging from 38% to 96%.12 The presence of neutropenia is the most important prognostic factor for mortality at the time of diagnosis.13

Prompt empiric therapy should be initiated after obtaining wound and blood cultures in those with infection until the causative organism and its susceptibility are identified. Pseudomonal infections account for 4% of all cases of hospital-acquired bacteremia and are the third leading cause of gram-negative bloodstream infection.7 Initial broad-spectrum antibiotics include antipseudomonal β-lactams (piperacillin-tazobactam), cephalosporins (cefepime), fluoroquinolones (levofloxacin), and carbapenems (imipenem).1,7 Medical therapy alone may be sufficient without requiring extensive surgical debridement to remove necrotic tissue in some patients. Surgical debridement usually is warranted for lesions larger than 10 cm in diameter.3 Our patient was treated with intravenous cefepime with resolution and was followed with outpatient oral levofloxacin as appropriate. A high index of suspicion should be maintained for relapsing pseudomonal EG infection among patients with AIDS, as the reported recurrence rate is 57%.14

Clinically, the differential diagnosis of EG presenting in immunocompromised patients or individuals with underlying malignancy includes pyoderma gangrenosum, papulonecrotic tuberculid, and leukemia cutis. An erythematous rash with central necrosis presenting in a patient with systemic symptoms is pathognomonic for erythema migrans and should be considered as a diagnostic possibility in areas endemic for Lyme disease in the United States, including the northeastern, mid-Atlantic, and north-central regions.15 A thorough history, physical examination, basic laboratory studies, and histopathology are critical to differentiate between these entities with similar macroscopic features. Pyoderma gangrenosum histologically manifests as a noninfectious, deep, suppurative folliculitis with leukocytoclastic vasculitis in 40% of cases.16 Although papulonecrotic tuberculid can present with dermal necrosis resulting from a hypersensitivity reaction to antigenic components of mycobacteria, there typically are granulomatous infiltrates present and a lack of observed organisms on histopathology.17 Although leukemia cutis infrequently occurs in patients diagnosed with leukemia, its salient features on pathology are nodular or diffuse infiltrates of leukemic cells in the dermis and subcutis with a high nuclear-to-cytoplasmic ratio, often with prominent nucleoli.18 Lyme disease can present in various ways; however, cutaneous involvement in the primary lesion is histologically characterized by a perivascular lymphohistiocytic infiltrate containing plasma cells at the periphery of the expanding annular lesion and eosinophils present at the center.19

References
  1. Abdou A, Hassam B. Ecthyma gangrenosum [in French]. Pan Afr Med J. 2018;30:95. doi:10.11604/pamj.2018.30.95.6244
  2. Vaiman M, Lazarovitch T, Heller L, et al. Ecthyma gangrenosum and ecthyma-like lesions: review article. Eur J Clin Microbiol Infect Dis. 2015;34:633-639. doi:10.1007/s10096-014-2277-6
  3. Vaiman M, Lasarovitch T, Heller L, et al. Ecthyma gangrenosum versus ecthyma-like lesions: should we separate these conditions? Acta Dermatovenerol Alp Pannonica Adriat. 2015;24:69-72. doi:10.15570 /actaapa.2015.18
  4. Reich HL, Williams Fadeyi D, Naik NS, et al. Nonpseudomonal ecthyma gangrenosum. J Am Acad Dermatol. 2004;50(5 suppl): S114-S117. doi:10.1016/j.jaad.2003.09.019
  5. Hawkley T, Chang D, Pollard W, et al. Ecthyma gangrenosum caused by Citrobacter freundii [published online July 27, 2017]. BMJ Case Rep. doi:10.1136/bcr-2017-220996
  6. Santhaseelan RG, Muralidhar V. Non-pseudomonal ecthyma gangrenosum caused by methicillin-resistant Staphylococcus aureus (MRSA) in a chronic alcoholic patient [published online August 3, 2017]. BMJ Case Rep. doi:10.1136/bcr-2017-220983m
  7. Bassetti M, Vena A, Croxatto A, et al. How to manage Pseudomonas aeruginosa infections [published online May 29, 2018]. Drugs Context. 2018;7:212527. doi:10.7573/dic.212527
  8. Llamas-Velasco M, Alegría V, Santos-Briz Á, et al. Occlusive nonvasculitic vasculopathy. Am J Dermatopathol. 2017;39:637-662. doi:10.1097/DAD.0000000000000766
  9. Sarkar S, Patra AK, Mondal M. Ecthyma gangrenosum in the periorbital region in a previously healthy immunocompetent woman without bacteremia. Indian Dermatol Online J. 2016;7:36-39. doi:10.4103/2229-5178.174326
  10. Ponka D, Baddar F. Wood lamp examination. Can Fam Physician. 2012;58:976.
  11. Van den Broek PJ, Van der Meer JWM, Kunst MW. The pathogenesis of ecthyma gangrenosum. J Infect. 1979;1:263-267. doi:10.1016 /S0163-4453(79)91329-X
  12. Downey DM, O’Bryan MC, Burdette SD, et al. Ecthyma gangrenosum in a patient with toxic epidermal necrolysis. J Burn Care Res. 2007;28:198-202. doi:10.1097/BCR.0B013E31802CA481
  13. Martínez-Longoria CA, Rosales-Solis GM, Ocampo-Garza J, et al. Ecthyma gangrenosum: a report of eight cases. An Bras Dermatol. 2017;92:698-700. doi:10.1590/abd1806-4841.20175580
  14. Khan MO, Montecalvo MA, Davis I, et al. Ecthyma gangrenosum in patients with acquired immunodeficiency syndrome. Cutis. 2000;66:121-123.
  15. Nadelman RB, Wormser GP. Lyme borreliosis. Lancet. 1998; 352:557-565.
  16. Su WP, Schroeter AL, Perry HO, et al. Histopathologic and immunopathologic study of pyoderma gangrenosum. J Cutan Pathol. 1986;13:323-330. doi:10.1111/j.1600-0560.1986.tb00466.x
  17. Tirumalae R, Yeliur IK, Antony M, et al. Papulonecrotic tuberculidclinicopathologic and molecular features of 12 Indian patients. Dermatol Pract Concept. 2014;4:17-22. doi:10.5826/dpc.0402a03
  18. Obiozor C, Ganguly S, Fraga GR. Leukemia cutis with lymphoglandular bodies: a clue to acute lymphoblastic leukemia cutis [published online August 15, 2015]. Dermatol Online J. 2015;21:13030/qt6m18g35f
  19. Vasudevan B, Chatterjee M. Lyme borreliosis and skin. Indian J Dermatol. 2013;58:167-174. doi:10.4103/0019-5154.110822
References
  1. Abdou A, Hassam B. Ecthyma gangrenosum [in French]. Pan Afr Med J. 2018;30:95. doi:10.11604/pamj.2018.30.95.6244
  2. Vaiman M, Lazarovitch T, Heller L, et al. Ecthyma gangrenosum and ecthyma-like lesions: review article. Eur J Clin Microbiol Infect Dis. 2015;34:633-639. doi:10.1007/s10096-014-2277-6
  3. Vaiman M, Lasarovitch T, Heller L, et al. Ecthyma gangrenosum versus ecthyma-like lesions: should we separate these conditions? Acta Dermatovenerol Alp Pannonica Adriat. 2015;24:69-72. doi:10.15570 /actaapa.2015.18
  4. Reich HL, Williams Fadeyi D, Naik NS, et al. Nonpseudomonal ecthyma gangrenosum. J Am Acad Dermatol. 2004;50(5 suppl): S114-S117. doi:10.1016/j.jaad.2003.09.019
  5. Hawkley T, Chang D, Pollard W, et al. Ecthyma gangrenosum caused by Citrobacter freundii [published online July 27, 2017]. BMJ Case Rep. doi:10.1136/bcr-2017-220996
  6. Santhaseelan RG, Muralidhar V. Non-pseudomonal ecthyma gangrenosum caused by methicillin-resistant Staphylococcus aureus (MRSA) in a chronic alcoholic patient [published online August 3, 2017]. BMJ Case Rep. doi:10.1136/bcr-2017-220983m
  7. Bassetti M, Vena A, Croxatto A, et al. How to manage Pseudomonas aeruginosa infections [published online May 29, 2018]. Drugs Context. 2018;7:212527. doi:10.7573/dic.212527
  8. Llamas-Velasco M, Alegría V, Santos-Briz Á, et al. Occlusive nonvasculitic vasculopathy. Am J Dermatopathol. 2017;39:637-662. doi:10.1097/DAD.0000000000000766
  9. Sarkar S, Patra AK, Mondal M. Ecthyma gangrenosum in the periorbital region in a previously healthy immunocompetent woman without bacteremia. Indian Dermatol Online J. 2016;7:36-39. doi:10.4103/2229-5178.174326
  10. Ponka D, Baddar F. Wood lamp examination. Can Fam Physician. 2012;58:976.
  11. Van den Broek PJ, Van der Meer JWM, Kunst MW. The pathogenesis of ecthyma gangrenosum. J Infect. 1979;1:263-267. doi:10.1016 /S0163-4453(79)91329-X
  12. Downey DM, O’Bryan MC, Burdette SD, et al. Ecthyma gangrenosum in a patient with toxic epidermal necrolysis. J Burn Care Res. 2007;28:198-202. doi:10.1097/BCR.0B013E31802CA481
  13. Martínez-Longoria CA, Rosales-Solis GM, Ocampo-Garza J, et al. Ecthyma gangrenosum: a report of eight cases. An Bras Dermatol. 2017;92:698-700. doi:10.1590/abd1806-4841.20175580
  14. Khan MO, Montecalvo MA, Davis I, et al. Ecthyma gangrenosum in patients with acquired immunodeficiency syndrome. Cutis. 2000;66:121-123.
  15. Nadelman RB, Wormser GP. Lyme borreliosis. Lancet. 1998; 352:557-565.
  16. Su WP, Schroeter AL, Perry HO, et al. Histopathologic and immunopathologic study of pyoderma gangrenosum. J Cutan Pathol. 1986;13:323-330. doi:10.1111/j.1600-0560.1986.tb00466.x
  17. Tirumalae R, Yeliur IK, Antony M, et al. Papulonecrotic tuberculidclinicopathologic and molecular features of 12 Indian patients. Dermatol Pract Concept. 2014;4:17-22. doi:10.5826/dpc.0402a03
  18. Obiozor C, Ganguly S, Fraga GR. Leukemia cutis with lymphoglandular bodies: a clue to acute lymphoblastic leukemia cutis [published online August 15, 2015]. Dermatol Online J. 2015;21:13030/qt6m18g35f
  19. Vasudevan B, Chatterjee M. Lyme borreliosis and skin. Indian J Dermatol. 2013;58:167-174. doi:10.4103/0019-5154.110822
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A 58-year-old man who was receiving gilteritinib therapy for relapsed acute myeloid leukemia presented to the emergency department with a painful, rapidly enlarging lesion on the right medial thigh of 2 days’ duration that was accompanied by fever (temperature, 39.2 °C) and body aches. Physical examination revealed a tender annular plaque with a dark violaceous halo overlying a larger area of erythema and induration. Laboratory evaluation revealed a white blood cell count of 600/μL (reference range, 4500–11,000/μL) and an absolute neutrophil count of 200/μL (reference range, 1800–7000/μL). A biopsy was performed.

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Progressive Axillary Hyperpigmentation

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The Diagnosis: Dowling-Degos Disease

Histopathology demonstrated elongation of the epidermal rete ridges with increased basal pigmentation, suprapapillary epithelial thinning, dermal melanophages, and a mild lymphocytic infiltrate (Figure). Given the clinical and histologic findings, a diagnosis of Dowling-Degos disease (DDD) was made. The patient was counseled on the increased risk for her children developing DDD. Treatment with the erbium:YAG (Er:YAG) laser subsequently was initiated.

Histopathology showed elongation of the rete ridges with increased pigmentation within the basal layer, suprapapillary epithelial thinning, and a mild perivascular infiltrate (H&E, original magnifications ×10 and ×40).

Dowling-Degos disease (also known as reticulate pigmented anomaly of the flexures) is an uncommon autosomal-dominant condition characterized by reticular hyperpigmentation involving the flexural and intertriginous sites. Classic DDD commonly is caused by lossof-function mutations in the keratin 5 gene, KRT51; however, DDD also may result from loss-of-function mutations in the protein O-fucosyltransferase 1, POFUT1, and protein O-glucosyltransferase 1, POGLUT1, genes.2

Rare cases of DDD associated with hidradenitis suppurativa are caused by mutations in the presenilin enhancer protein 2 gene, PSENEN.3

Of note, a missense mutation in KRT5 is implicated in epidermolysis bullosa simplex with mottled pigmentation. Onset of DDD typically occurs during the third to fourth decades of life. Reticulated hyperpigmented macules initially occur in the axillae and groin and progressively increase over time to involve the neck, inframammary folds, trunk, and flexural surfaces of the arms and thighs. Patients additionally may present with pitted perioral scars, comedolike lesions on the back and neck, epidermoid cysts, and hidradenitis suppurativa. Keratoacanthoma and squamous cell carcinoma rarely have been reported in association with classic DDD.4,5

Dowling-Degos disease usually is asymptomatic, though pruritus seldom may occur in the affected flexural areas. Histologically, the epidermal rete ridges are elongated in a filiform or antlerlike pattern with increased pigmentation of the basal layer and thinning of the suprapapillary epithelium. Dermal melanosis and a mild perivascular lymphohistiocytic infiltrate also are present with no increase in the number of melanocytes.6,7 Galli-Galli disease is a variant of DDD that shares similar clinical and histologic features of DDD but is distinguished from DDD by suprabasilar nondyskeratotic acantholysis on histology.8

Regarding other differential diagnoses for our patient, acanthosis nigricans may be distinguished clinically by the presence of velvety and/or verrucous plaques, commonly in the neck folds and axillae. Histologically, acanthosis nigricans is distinct from DDD and involves hyperkeratosis, acanthosis, and epidermal papillomatosis. Our patient had no history of diabetes mellitus or insulin resistance. Granular parakeratosis presents with hyperpigmented hyperkeratotic papules and plaques classically confined to the axillary region; however, the involvement of other intertriginous areas may occur. Histologically, granular parakeratosis demonstrates compact parakeratosis with small bluish keratohyalin granules within the stratum corneum. Confluent and reticulated papillomatosis presents with red-brown keratotic papules that initially appear in the intermammary region and spread laterally forming a reticulated pattern. Histology is similar to acanthosis nigricans and demonstrates hyperkeratosis, acanthosis, and papillomatosis. Inverse psoriasis presents with symmetric and sharply demarcated, erythematous, nonscaly plaques in the intertriginous areas. The plaques of inverse psoriasis may be pruritic and/or sore and occasionally may become macerated. Inverse psoriasis shares similar histologic findings compared to classic plaque psoriasis but may have less confluent parakeratosis.

Treatment of DDD essentially is reserved for cosmetic reasons. Topical hydroquinone, tretinoin, and corticosteroids have been used with limited to no success.5,9 Beneficial results after treatment with the Er:YAG laser have been reported.10

References
  1. Betz RC, Planko L, Eigelshoven S, et al. Loss-of-function mutations in the keratin 5 gene lead to Dowling-Degos disease. Am J Hum Genet. 2006;78:510-519.
  2. Basmanav FB, Oprisoreanu AM, Pasternack SM, et al. Mutations in POGLUT1, encoding protein O-glucosyltransferase 1, cause autosomaldominant Dowling-Degos disease. Am J Hum Genet. 2014;94:135-143.
  3. Pavlovsky M, Sarig O, Eskin-Schwartz M, et al. A phenotype combining hidradenitis suppurativa with Dowling-Degos disease caused by a founder mutation in PSENEN. Br J Dermatol. 2018;178:502-508.
  4. Ujihara M, Kamakura T, Ikeda M, et al. Dowling-Degos disease associated with squamous cell carcinomas on the dappled pigmentation. Br J Dermatol. 2002;147:568-571.
  5. Weber LA, Kantor GR, Bergfeld WF. Reticulate pigmented anomaly of the flexures (Dowling-Degos disease): a case report associated with hidradenitis suppurativa and squamous cell carcinoma. Cutis. 1990;45:446-450.
  6. Jones EW, Grice K. Reticulate pigmented anomaly of the flexures. Dowing Degos disease, a new genodermatosis. Arch Dermatol. 1978;114:1150-1157.
  7. Kim YC, Davis MD, Schanbacher CF, et al. Dowling-Degos disease (reticulate pigmented anomaly of the flexures): a clinical and histopathologic study of 6 cases. J Am Acad Dermatol. 1999; 40:462-467.
  8. Reisenauer AK, Wordingham SV, York J, et al. Heterozygous frameshift mutation in keratin 5 in a family with Galli-Galli disease. Br J Dermatol. 2014;170:1362-1365.
  9. Oppolzer G, Schwarz T, Duschet P, et al. Dowling-Degos disease: unsuccessful therapeutic trial with retinoids [in German]. Hautarzt. 1987;38:615-618.
  10. Wenzel G, Petrow W, Tappe K, et al. Treatment of Dowling-Degos disease with Er:YAG-laser: results after 2.5 years. Dermatol Surg. 2003;29:1161-1162.
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Correspondence: Spyros M. Siscos, MD, Division of Dermatology, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160 (ssiscos@kumc.edu). 

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Correspondence: Spyros M. Siscos, MD, Division of Dermatology, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160 (ssiscos@kumc.edu). 

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From the Division of Dermatology, University of Kansas Medical Center, Kansas City.

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Correspondence: Spyros M. Siscos, MD, Division of Dermatology, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160 (ssiscos@kumc.edu). 

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The Diagnosis: Dowling-Degos Disease

Histopathology demonstrated elongation of the epidermal rete ridges with increased basal pigmentation, suprapapillary epithelial thinning, dermal melanophages, and a mild lymphocytic infiltrate (Figure). Given the clinical and histologic findings, a diagnosis of Dowling-Degos disease (DDD) was made. The patient was counseled on the increased risk for her children developing DDD. Treatment with the erbium:YAG (Er:YAG) laser subsequently was initiated.

Histopathology showed elongation of the rete ridges with increased pigmentation within the basal layer, suprapapillary epithelial thinning, and a mild perivascular infiltrate (H&E, original magnifications ×10 and ×40).

Dowling-Degos disease (also known as reticulate pigmented anomaly of the flexures) is an uncommon autosomal-dominant condition characterized by reticular hyperpigmentation involving the flexural and intertriginous sites. Classic DDD commonly is caused by lossof-function mutations in the keratin 5 gene, KRT51; however, DDD also may result from loss-of-function mutations in the protein O-fucosyltransferase 1, POFUT1, and protein O-glucosyltransferase 1, POGLUT1, genes.2

Rare cases of DDD associated with hidradenitis suppurativa are caused by mutations in the presenilin enhancer protein 2 gene, PSENEN.3

Of note, a missense mutation in KRT5 is implicated in epidermolysis bullosa simplex with mottled pigmentation. Onset of DDD typically occurs during the third to fourth decades of life. Reticulated hyperpigmented macules initially occur in the axillae and groin and progressively increase over time to involve the neck, inframammary folds, trunk, and flexural surfaces of the arms and thighs. Patients additionally may present with pitted perioral scars, comedolike lesions on the back and neck, epidermoid cysts, and hidradenitis suppurativa. Keratoacanthoma and squamous cell carcinoma rarely have been reported in association with classic DDD.4,5

Dowling-Degos disease usually is asymptomatic, though pruritus seldom may occur in the affected flexural areas. Histologically, the epidermal rete ridges are elongated in a filiform or antlerlike pattern with increased pigmentation of the basal layer and thinning of the suprapapillary epithelium. Dermal melanosis and a mild perivascular lymphohistiocytic infiltrate also are present with no increase in the number of melanocytes.6,7 Galli-Galli disease is a variant of DDD that shares similar clinical and histologic features of DDD but is distinguished from DDD by suprabasilar nondyskeratotic acantholysis on histology.8

Regarding other differential diagnoses for our patient, acanthosis nigricans may be distinguished clinically by the presence of velvety and/or verrucous plaques, commonly in the neck folds and axillae. Histologically, acanthosis nigricans is distinct from DDD and involves hyperkeratosis, acanthosis, and epidermal papillomatosis. Our patient had no history of diabetes mellitus or insulin resistance. Granular parakeratosis presents with hyperpigmented hyperkeratotic papules and plaques classically confined to the axillary region; however, the involvement of other intertriginous areas may occur. Histologically, granular parakeratosis demonstrates compact parakeratosis with small bluish keratohyalin granules within the stratum corneum. Confluent and reticulated papillomatosis presents with red-brown keratotic papules that initially appear in the intermammary region and spread laterally forming a reticulated pattern. Histology is similar to acanthosis nigricans and demonstrates hyperkeratosis, acanthosis, and papillomatosis. Inverse psoriasis presents with symmetric and sharply demarcated, erythematous, nonscaly plaques in the intertriginous areas. The plaques of inverse psoriasis may be pruritic and/or sore and occasionally may become macerated. Inverse psoriasis shares similar histologic findings compared to classic plaque psoriasis but may have less confluent parakeratosis.

Treatment of DDD essentially is reserved for cosmetic reasons. Topical hydroquinone, tretinoin, and corticosteroids have been used with limited to no success.5,9 Beneficial results after treatment with the Er:YAG laser have been reported.10

The Diagnosis: Dowling-Degos Disease

Histopathology demonstrated elongation of the epidermal rete ridges with increased basal pigmentation, suprapapillary epithelial thinning, dermal melanophages, and a mild lymphocytic infiltrate (Figure). Given the clinical and histologic findings, a diagnosis of Dowling-Degos disease (DDD) was made. The patient was counseled on the increased risk for her children developing DDD. Treatment with the erbium:YAG (Er:YAG) laser subsequently was initiated.

Histopathology showed elongation of the rete ridges with increased pigmentation within the basal layer, suprapapillary epithelial thinning, and a mild perivascular infiltrate (H&E, original magnifications ×10 and ×40).

Dowling-Degos disease (also known as reticulate pigmented anomaly of the flexures) is an uncommon autosomal-dominant condition characterized by reticular hyperpigmentation involving the flexural and intertriginous sites. Classic DDD commonly is caused by lossof-function mutations in the keratin 5 gene, KRT51; however, DDD also may result from loss-of-function mutations in the protein O-fucosyltransferase 1, POFUT1, and protein O-glucosyltransferase 1, POGLUT1, genes.2

Rare cases of DDD associated with hidradenitis suppurativa are caused by mutations in the presenilin enhancer protein 2 gene, PSENEN.3

Of note, a missense mutation in KRT5 is implicated in epidermolysis bullosa simplex with mottled pigmentation. Onset of DDD typically occurs during the third to fourth decades of life. Reticulated hyperpigmented macules initially occur in the axillae and groin and progressively increase over time to involve the neck, inframammary folds, trunk, and flexural surfaces of the arms and thighs. Patients additionally may present with pitted perioral scars, comedolike lesions on the back and neck, epidermoid cysts, and hidradenitis suppurativa. Keratoacanthoma and squamous cell carcinoma rarely have been reported in association with classic DDD.4,5

Dowling-Degos disease usually is asymptomatic, though pruritus seldom may occur in the affected flexural areas. Histologically, the epidermal rete ridges are elongated in a filiform or antlerlike pattern with increased pigmentation of the basal layer and thinning of the suprapapillary epithelium. Dermal melanosis and a mild perivascular lymphohistiocytic infiltrate also are present with no increase in the number of melanocytes.6,7 Galli-Galli disease is a variant of DDD that shares similar clinical and histologic features of DDD but is distinguished from DDD by suprabasilar nondyskeratotic acantholysis on histology.8

Regarding other differential diagnoses for our patient, acanthosis nigricans may be distinguished clinically by the presence of velvety and/or verrucous plaques, commonly in the neck folds and axillae. Histologically, acanthosis nigricans is distinct from DDD and involves hyperkeratosis, acanthosis, and epidermal papillomatosis. Our patient had no history of diabetes mellitus or insulin resistance. Granular parakeratosis presents with hyperpigmented hyperkeratotic papules and plaques classically confined to the axillary region; however, the involvement of other intertriginous areas may occur. Histologically, granular parakeratosis demonstrates compact parakeratosis with small bluish keratohyalin granules within the stratum corneum. Confluent and reticulated papillomatosis presents with red-brown keratotic papules that initially appear in the intermammary region and spread laterally forming a reticulated pattern. Histology is similar to acanthosis nigricans and demonstrates hyperkeratosis, acanthosis, and papillomatosis. Inverse psoriasis presents with symmetric and sharply demarcated, erythematous, nonscaly plaques in the intertriginous areas. The plaques of inverse psoriasis may be pruritic and/or sore and occasionally may become macerated. Inverse psoriasis shares similar histologic findings compared to classic plaque psoriasis but may have less confluent parakeratosis.

Treatment of DDD essentially is reserved for cosmetic reasons. Topical hydroquinone, tretinoin, and corticosteroids have been used with limited to no success.5,9 Beneficial results after treatment with the Er:YAG laser have been reported.10

References
  1. Betz RC, Planko L, Eigelshoven S, et al. Loss-of-function mutations in the keratin 5 gene lead to Dowling-Degos disease. Am J Hum Genet. 2006;78:510-519.
  2. Basmanav FB, Oprisoreanu AM, Pasternack SM, et al. Mutations in POGLUT1, encoding protein O-glucosyltransferase 1, cause autosomaldominant Dowling-Degos disease. Am J Hum Genet. 2014;94:135-143.
  3. Pavlovsky M, Sarig O, Eskin-Schwartz M, et al. A phenotype combining hidradenitis suppurativa with Dowling-Degos disease caused by a founder mutation in PSENEN. Br J Dermatol. 2018;178:502-508.
  4. Ujihara M, Kamakura T, Ikeda M, et al. Dowling-Degos disease associated with squamous cell carcinomas on the dappled pigmentation. Br J Dermatol. 2002;147:568-571.
  5. Weber LA, Kantor GR, Bergfeld WF. Reticulate pigmented anomaly of the flexures (Dowling-Degos disease): a case report associated with hidradenitis suppurativa and squamous cell carcinoma. Cutis. 1990;45:446-450.
  6. Jones EW, Grice K. Reticulate pigmented anomaly of the flexures. Dowing Degos disease, a new genodermatosis. Arch Dermatol. 1978;114:1150-1157.
  7. Kim YC, Davis MD, Schanbacher CF, et al. Dowling-Degos disease (reticulate pigmented anomaly of the flexures): a clinical and histopathologic study of 6 cases. J Am Acad Dermatol. 1999; 40:462-467.
  8. Reisenauer AK, Wordingham SV, York J, et al. Heterozygous frameshift mutation in keratin 5 in a family with Galli-Galli disease. Br J Dermatol. 2014;170:1362-1365.
  9. Oppolzer G, Schwarz T, Duschet P, et al. Dowling-Degos disease: unsuccessful therapeutic trial with retinoids [in German]. Hautarzt. 1987;38:615-618.
  10. Wenzel G, Petrow W, Tappe K, et al. Treatment of Dowling-Degos disease with Er:YAG-laser: results after 2.5 years. Dermatol Surg. 2003;29:1161-1162.
References
  1. Betz RC, Planko L, Eigelshoven S, et al. Loss-of-function mutations in the keratin 5 gene lead to Dowling-Degos disease. Am J Hum Genet. 2006;78:510-519.
  2. Basmanav FB, Oprisoreanu AM, Pasternack SM, et al. Mutations in POGLUT1, encoding protein O-glucosyltransferase 1, cause autosomaldominant Dowling-Degos disease. Am J Hum Genet. 2014;94:135-143.
  3. Pavlovsky M, Sarig O, Eskin-Schwartz M, et al. A phenotype combining hidradenitis suppurativa with Dowling-Degos disease caused by a founder mutation in PSENEN. Br J Dermatol. 2018;178:502-508.
  4. Ujihara M, Kamakura T, Ikeda M, et al. Dowling-Degos disease associated with squamous cell carcinomas on the dappled pigmentation. Br J Dermatol. 2002;147:568-571.
  5. Weber LA, Kantor GR, Bergfeld WF. Reticulate pigmented anomaly of the flexures (Dowling-Degos disease): a case report associated with hidradenitis suppurativa and squamous cell carcinoma. Cutis. 1990;45:446-450.
  6. Jones EW, Grice K. Reticulate pigmented anomaly of the flexures. Dowing Degos disease, a new genodermatosis. Arch Dermatol. 1978;114:1150-1157.
  7. Kim YC, Davis MD, Schanbacher CF, et al. Dowling-Degos disease (reticulate pigmented anomaly of the flexures): a clinical and histopathologic study of 6 cases. J Am Acad Dermatol. 1999; 40:462-467.
  8. Reisenauer AK, Wordingham SV, York J, et al. Heterozygous frameshift mutation in keratin 5 in a family with Galli-Galli disease. Br J Dermatol. 2014;170:1362-1365.
  9. Oppolzer G, Schwarz T, Duschet P, et al. Dowling-Degos disease: unsuccessful therapeutic trial with retinoids [in German]. Hautarzt. 1987;38:615-618.
  10. Wenzel G, Petrow W, Tappe K, et al. Treatment of Dowling-Degos disease with Er:YAG-laser: results after 2.5 years. Dermatol Surg. 2003;29:1161-1162.
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A 50-year-old Hispanic woman presented with asymptomatic, progressive, brown hyperpigmentation involving the axillae, neck, upper back, and inframammary areas of 5 years’ duration. She had no other notable medical history; family history was unremarkable. She had been treated with topical hydroquinone and tretinoin by an outside physician without improvement. Physical examination revealed reticulated hyperpigmented macules and patches involving the inverse regions of the neck, axillae, and inframammary regions. Additionally, acneform pitted scars involving the perioral region were seen. A 4.0-mm punch biopsy of the right axilla was performed.

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Asymptomatic Discolored Lesions on the Groin

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The Diagnosis: Lichen Planus Pigmentosus-Inversus 

Histopathologic examination revealed hyperkeratosis with dense, bandlike, lymphocytic inflammation at the dermoepidermal junction with associated melanin-containing macrophages in the papillary dermis (Figure 1). The physical examination and histopathology were consistent with a diagnosis of lichen planus pigmentosus-inversus (LPPI). Treatment was discussed with the patient, with options including phototherapy, tacrolimus, or a high-dose steroid. Given that the lesions were asymptomatic and not bothersome, the patient denied treatment and agreed to routine follow-up. 

Figure 1. Lichen planus pigmentosus-inversus. A, Hyperkeratosis with lymphocytic inflammation at the dermoepidermal junction with melanin-containing macrophages in the papillary dermis (H&E, original magnification ×40). B, Bandlike lymphocytic infiltrate at the dermoepidermal junction (H&E, original magnification ×20).


The first case of LPPI was reported in 20011; since then, approximately 100 cases have been reported in the literature.2 A rare variant of lichen planus, LPPI predominantly occurs in middle-aged women.2,3 Lichen planus pigmentosus-inversus is characterized by well-circumscribed, brown macules confined to non-sun-exposed intertriginous areas such as the axillae and groin.2 Although the rash remains localized, multiple lesions could arise in the same area, such as the groin as seen in our patient (Figure 2). Unlike in lichen planus, the oral mucosa, nails, and scalp are not affected. Furthermore, pruritus typically is absent in most cases of LPPI.2,4 Histopathologic findings include an atrophic epidermis with lichenoid infiltrates of lymphocytes and histocytes as well as substantial pigmentary incontinence with melanin-containing macrophages in the papillary dermis.4,5 

Figure 2. Lichen planus pigmentosus-inversus. Well-circumscribed, hyperpigmented macules on the lower abdomen and groin.

Given the gender, age, and clinical features of our patient, this case represents a classic scenario of LPPI. It currently is unknown if ethnicity plays a role in the disorder. Lichen planus pigmentosus-inversus initially was thought to be more prevalent in White patients; however, studies have been reported in individuals with darker skin.1,2 

The main differential diagnosis includes erythema dyschromicum perstans, postinflammatory hyperpigmentation, and lichen planus. Although erythema dyschromicum perstans develops in individuals with darker skin, lesions are restricted to the upper torso and limbs.2-4 In both lichen planus and lichen actinicus, skin findings primarily develop in sun-exposed areas, such as the face, neck, and hands.4,6 Given the negative history of trauma, postinflammatory hyperpigmentation was unlikely in our patient. Furthermore, a distinguishing characteristic of LPPI is the deposition of melanin deep within the dermal layer.

Lesions developing in nonexposed intertriginous skin makes LPPI unique and distinguishes it from other more common conditions. The lesions commonly are hyperpigmented and are not as pruritic as other lichen-associated conditions. Lichen planus pigmentosus-inversus often persists for months, and the rash generally is resistant to treatment.2,5 Topical tacrolimus and high-dose steroids may improve symptoms, though results have varied substantially. In addition, some cases have resolved spontaneously.1,4,6,7 Because LPPI is asymptomatic and benign, spontaneous resolution and routine care is a reasonable treatment strategy. Some cases have supported this strategy as safe and high-value care.2 

References
  1. Mohamed M, Korbi M, Hammedi F, et al. Lichen planus pigmentosus inversus: a series of 10 Tunisian patients. Int J Dermatol. 2016;55:1088-1091.
  2. Lichen planus pigmentosus-inversus: a rare variant of lichen planus. J Am Acad Dermatol. 2015;72(suppl 1):AB239. https://doi.org /10.1016/j.jaad.2015.02.959
  3. Chen S, Sun W, Zhou G, et al. Lichen planus pigmentosus-inversus: report of three Chinese cases and review of the published work. J Dermatol. 2015;42:77-80.
  4. Tabanlıoǧlu-Onan D, Íncel-Uysal P, Öktem A, et al. Lichen planus pigmentosus-inversus: a peculiar variant of lichen planus. Dermatologica Sinica. 2017;35:210-212.
  5. Barros HR, Almeida JR, Mattos e Dinato SL, et al. Lichen planus pigmentosus inversus. An Bras Dermatol. 2013;88(6 suppl 1):146-149.
  6. Bennàssar A, Mas A, Julià M, et al. Annular plaques in the skin folds: 4 cases of lichen planus pigmentosus-inversus [in Spanish]. Actas Dermosifiliogr. 2009;100:602-605.
  7. Ghorbel HH, Badri T, Ben Brahim E, et al. Lichen planus pigmentosus inversus. Indian J Dermatol Venereol Leprol. 2014;80:580.
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The authors report no conflict of interest.

Correspondence: Courtney Cook, DO, Oklahoma State University Center for Health Sciences, 1111 W 17th St, Tulsa, OK 74107 (courco@okstate.edu). 

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Correspondence: Courtney Cook, DO, Oklahoma State University Center for Health Sciences, 1111 W 17th St, Tulsa, OK 74107 (courco@okstate.edu). 

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Drs. Hoang, Downing, Rickstrew, Siscos, and Rajpara are from the Division of Dermatology, University of Kansas Medical Center, Kansas City. Dr. Cook is from the Oklahoma State University Center for Health Sciences, Tulsa.

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Correspondence: Courtney Cook, DO, Oklahoma State University Center for Health Sciences, 1111 W 17th St, Tulsa, OK 74107 (courco@okstate.edu). 

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The Diagnosis: Lichen Planus Pigmentosus-Inversus 

Histopathologic examination revealed hyperkeratosis with dense, bandlike, lymphocytic inflammation at the dermoepidermal junction with associated melanin-containing macrophages in the papillary dermis (Figure 1). The physical examination and histopathology were consistent with a diagnosis of lichen planus pigmentosus-inversus (LPPI). Treatment was discussed with the patient, with options including phototherapy, tacrolimus, or a high-dose steroid. Given that the lesions were asymptomatic and not bothersome, the patient denied treatment and agreed to routine follow-up. 

Figure 1. Lichen planus pigmentosus-inversus. A, Hyperkeratosis with lymphocytic inflammation at the dermoepidermal junction with melanin-containing macrophages in the papillary dermis (H&E, original magnification ×40). B, Bandlike lymphocytic infiltrate at the dermoepidermal junction (H&E, original magnification ×20).


The first case of LPPI was reported in 20011; since then, approximately 100 cases have been reported in the literature.2 A rare variant of lichen planus, LPPI predominantly occurs in middle-aged women.2,3 Lichen planus pigmentosus-inversus is characterized by well-circumscribed, brown macules confined to non-sun-exposed intertriginous areas such as the axillae and groin.2 Although the rash remains localized, multiple lesions could arise in the same area, such as the groin as seen in our patient (Figure 2). Unlike in lichen planus, the oral mucosa, nails, and scalp are not affected. Furthermore, pruritus typically is absent in most cases of LPPI.2,4 Histopathologic findings include an atrophic epidermis with lichenoid infiltrates of lymphocytes and histocytes as well as substantial pigmentary incontinence with melanin-containing macrophages in the papillary dermis.4,5 

Figure 2. Lichen planus pigmentosus-inversus. Well-circumscribed, hyperpigmented macules on the lower abdomen and groin.

Given the gender, age, and clinical features of our patient, this case represents a classic scenario of LPPI. It currently is unknown if ethnicity plays a role in the disorder. Lichen planus pigmentosus-inversus initially was thought to be more prevalent in White patients; however, studies have been reported in individuals with darker skin.1,2 

The main differential diagnosis includes erythema dyschromicum perstans, postinflammatory hyperpigmentation, and lichen planus. Although erythema dyschromicum perstans develops in individuals with darker skin, lesions are restricted to the upper torso and limbs.2-4 In both lichen planus and lichen actinicus, skin findings primarily develop in sun-exposed areas, such as the face, neck, and hands.4,6 Given the negative history of trauma, postinflammatory hyperpigmentation was unlikely in our patient. Furthermore, a distinguishing characteristic of LPPI is the deposition of melanin deep within the dermal layer.

Lesions developing in nonexposed intertriginous skin makes LPPI unique and distinguishes it from other more common conditions. The lesions commonly are hyperpigmented and are not as pruritic as other lichen-associated conditions. Lichen planus pigmentosus-inversus often persists for months, and the rash generally is resistant to treatment.2,5 Topical tacrolimus and high-dose steroids may improve symptoms, though results have varied substantially. In addition, some cases have resolved spontaneously.1,4,6,7 Because LPPI is asymptomatic and benign, spontaneous resolution and routine care is a reasonable treatment strategy. Some cases have supported this strategy as safe and high-value care.2 

The Diagnosis: Lichen Planus Pigmentosus-Inversus 

Histopathologic examination revealed hyperkeratosis with dense, bandlike, lymphocytic inflammation at the dermoepidermal junction with associated melanin-containing macrophages in the papillary dermis (Figure 1). The physical examination and histopathology were consistent with a diagnosis of lichen planus pigmentosus-inversus (LPPI). Treatment was discussed with the patient, with options including phototherapy, tacrolimus, or a high-dose steroid. Given that the lesions were asymptomatic and not bothersome, the patient denied treatment and agreed to routine follow-up. 

Figure 1. Lichen planus pigmentosus-inversus. A, Hyperkeratosis with lymphocytic inflammation at the dermoepidermal junction with melanin-containing macrophages in the papillary dermis (H&E, original magnification ×40). B, Bandlike lymphocytic infiltrate at the dermoepidermal junction (H&E, original magnification ×20).


The first case of LPPI was reported in 20011; since then, approximately 100 cases have been reported in the literature.2 A rare variant of lichen planus, LPPI predominantly occurs in middle-aged women.2,3 Lichen planus pigmentosus-inversus is characterized by well-circumscribed, brown macules confined to non-sun-exposed intertriginous areas such as the axillae and groin.2 Although the rash remains localized, multiple lesions could arise in the same area, such as the groin as seen in our patient (Figure 2). Unlike in lichen planus, the oral mucosa, nails, and scalp are not affected. Furthermore, pruritus typically is absent in most cases of LPPI.2,4 Histopathologic findings include an atrophic epidermis with lichenoid infiltrates of lymphocytes and histocytes as well as substantial pigmentary incontinence with melanin-containing macrophages in the papillary dermis.4,5 

Figure 2. Lichen planus pigmentosus-inversus. Well-circumscribed, hyperpigmented macules on the lower abdomen and groin.

Given the gender, age, and clinical features of our patient, this case represents a classic scenario of LPPI. It currently is unknown if ethnicity plays a role in the disorder. Lichen planus pigmentosus-inversus initially was thought to be more prevalent in White patients; however, studies have been reported in individuals with darker skin.1,2 

The main differential diagnosis includes erythema dyschromicum perstans, postinflammatory hyperpigmentation, and lichen planus. Although erythema dyschromicum perstans develops in individuals with darker skin, lesions are restricted to the upper torso and limbs.2-4 In both lichen planus and lichen actinicus, skin findings primarily develop in sun-exposed areas, such as the face, neck, and hands.4,6 Given the negative history of trauma, postinflammatory hyperpigmentation was unlikely in our patient. Furthermore, a distinguishing characteristic of LPPI is the deposition of melanin deep within the dermal layer.

Lesions developing in nonexposed intertriginous skin makes LPPI unique and distinguishes it from other more common conditions. The lesions commonly are hyperpigmented and are not as pruritic as other lichen-associated conditions. Lichen planus pigmentosus-inversus often persists for months, and the rash generally is resistant to treatment.2,5 Topical tacrolimus and high-dose steroids may improve symptoms, though results have varied substantially. In addition, some cases have resolved spontaneously.1,4,6,7 Because LPPI is asymptomatic and benign, spontaneous resolution and routine care is a reasonable treatment strategy. Some cases have supported this strategy as safe and high-value care.2 

References
  1. Mohamed M, Korbi M, Hammedi F, et al. Lichen planus pigmentosus inversus: a series of 10 Tunisian patients. Int J Dermatol. 2016;55:1088-1091.
  2. Lichen planus pigmentosus-inversus: a rare variant of lichen planus. J Am Acad Dermatol. 2015;72(suppl 1):AB239. https://doi.org /10.1016/j.jaad.2015.02.959
  3. Chen S, Sun W, Zhou G, et al. Lichen planus pigmentosus-inversus: report of three Chinese cases and review of the published work. J Dermatol. 2015;42:77-80.
  4. Tabanlıoǧlu-Onan D, Íncel-Uysal P, Öktem A, et al. Lichen planus pigmentosus-inversus: a peculiar variant of lichen planus. Dermatologica Sinica. 2017;35:210-212.
  5. Barros HR, Almeida JR, Mattos e Dinato SL, et al. Lichen planus pigmentosus inversus. An Bras Dermatol. 2013;88(6 suppl 1):146-149.
  6. Bennàssar A, Mas A, Julià M, et al. Annular plaques in the skin folds: 4 cases of lichen planus pigmentosus-inversus [in Spanish]. Actas Dermosifiliogr. 2009;100:602-605.
  7. Ghorbel HH, Badri T, Ben Brahim E, et al. Lichen planus pigmentosus inversus. Indian J Dermatol Venereol Leprol. 2014;80:580.
References
  1. Mohamed M, Korbi M, Hammedi F, et al. Lichen planus pigmentosus inversus: a series of 10 Tunisian patients. Int J Dermatol. 2016;55:1088-1091.
  2. Lichen planus pigmentosus-inversus: a rare variant of lichen planus. J Am Acad Dermatol. 2015;72(suppl 1):AB239. https://doi.org /10.1016/j.jaad.2015.02.959
  3. Chen S, Sun W, Zhou G, et al. Lichen planus pigmentosus-inversus: report of three Chinese cases and review of the published work. J Dermatol. 2015;42:77-80.
  4. Tabanlıoǧlu-Onan D, Íncel-Uysal P, Öktem A, et al. Lichen planus pigmentosus-inversus: a peculiar variant of lichen planus. Dermatologica Sinica. 2017;35:210-212.
  5. Barros HR, Almeida JR, Mattos e Dinato SL, et al. Lichen planus pigmentosus inversus. An Bras Dermatol. 2013;88(6 suppl 1):146-149.
  6. Bennàssar A, Mas A, Julià M, et al. Annular plaques in the skin folds: 4 cases of lichen planus pigmentosus-inversus [in Spanish]. Actas Dermosifiliogr. 2009;100:602-605.
  7. Ghorbel HH, Badri T, Ben Brahim E, et al. Lichen planus pigmentosus inversus. Indian J Dermatol Venereol Leprol. 2014;80:580.
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A 45-year-old African American woman presented with an asymptomatic rash that had worsened over the month prior to presentation. It initially began on the upper thighs and then spread to the abdomen, groin, and buttocks. The rash was mildly pruritic and had grown both in size and number of lesions. She had not tried any new over-the-counter medications. Her medical history was notable for late-stage breast cancer diagnosed 4 years prior that was treated with radiation and neoadjuvant NeoPACT—carboplatin, docetaxel, and pembrolizumab. One year prior to presentation, she underwent a lumpectomy that was complicated by gas gangrene of the finger. She has been in remission since the surgery. Physical examination at the current presentation was remarkable for multiple well-circumscribed, hyperpigmented macules on the medial thighs, lower abdomen, and buttocks. Syphilis antibody screening was negative.

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