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Article
Changed
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Author(s)
Domenica Del Pozo, MD
Richard P. Usatine, MD
Candrice R. Heath, MD

Acne keloidalis nuchae (AKN) is a chronic inflammatory condition commonly affecting the occipital scalp and posterior neck. It causes discrete or extensive fibrosing papules that may coalesce to form pronounced ­tumorlike masses1,2 with scarring alopecia (Figure, A–C).3 Pustules, hair tufts, secondary bacterial infections, abscesses, and sinus tracts also may occur.1 The pathogenesis of AKN has been characterized as varying stages of follicular inflammation at the infundibular and isthmus levels followed by fibrotic occlusion of the ­follicular lumen.4 Pruritus, pain, bleeding, oozing, and a feeling of scalp tightness may occur.1,5

Umar et al6 performed a retrospective review of 108 men with AKN—58% of African descent, 37% Hispanic, 3% Asian, and 2% Middle Eastern—and proposed a 3-tier classification system for AKN. Tier 1 focused on the distribution and sagittal spread of AKN lesions between the clinical demarcation lines of the occipital notch and posterior hairline. Tier 2 focused on the type of lesions present—discrete papules or nodules, coalescing/abutting lesions, plaques (raised, atrophic, or indurated), or dome-shaped tumoral masses. Tier 3 focused on the presence or absence of co-existing dissecting cellulitis or folliculitis decalvans.6

Epidemiology

Acne keloidalis nuchae primarily manifests in adolescent and adult men of African or Afro-Caribbean descent.7 Among African American men, the prevalence of AKN ranges from 0.5% to 13.6%.8 Similar ranges have been reported among Nigerian, South African, and West African men.1 Acne keloidalis nuchae also affects Asian and Hispanic men but rarely is seen in non-Hispanic White men or in women of any ethnicity.9,10 The male to female ratio is 20:1.1,11 Hair texture, hairstyling practices such as closely shaved or faded haircuts, and genetics likely contribute to development of AKN. Sports and occupations that require the use of headgear or a tight collar may increase the risk for AKN.12

Key clinical features in people with darker skin tones

  • The lesions of AKN range in color from pink to dark brown or black. Postinflammatory hyperpigmentation or hyperchromia may be present around AKN lesions.
  • Chronicity of AKN may lead to extended use of high-potency topical or intralesional corticosteroids, which causes transient or long-lasting hypopigmentation, especially in those with darker skin tones.

Worth noting

  • Acne keloidalis nuchae can be disfiguring, which negatively impacts quality of life and self-esteem.12
  • Some occupations (eg, military, police) have hair policies that may not be favorable to those with or at risk for AKN.
  • Patients with AKN are 2 to 3 times more likely to present with metabolic syndrome, hypertension, type 2 diabetes mellitus, or obesity.13
 

 

Treatment

There are no treatments approved by the US Food and Drug Administration specifically for AKN. Treatment approaches are based on the pathophysiology, secondary impacts on the skin, and disease severity. Growing out the hair may prevent worsening and/or decrease the risk for new lesions.6

  • Options include but are not limited to topical and systemic therapies (eg, topical corticosteroids, oral or topical antibiotics, isotretinoin, topical retinoids, imiquimod, pimecrolimus), light devices (eg, phototherapy, laser), ablative therapies (eg, laser, cryotherapy, radiotherapy), and surgery (eg, excision, follicular unit excision), often in combination.6,14,15
  • Intralesional triamcinolone injections are considered standard of care. Adotama et al found that injecting ­triamcinolone into the deep dermis in the area of flat or papular AKN yielded better control of inflammation and decreased appearance of lesions compared with injecting individual lesions.16
  • For extensive AKN lesions that do not respond to ­less-invasive therapies, consider surgical techniques,6,17 such as follicular unit excision18 and more extensive surgical excisions building on approaches from pioneers Drs. John Kenney and Harold Pierce.19 An innovative surgical approach for removal of large AKNs is the bat excision technique—wound shape resembles a bat in a spread-eagled position—with secondary intention healing with or without debridement and/or tension sutures. The resulting linear scar acts as a new posterior hair line.20
 

 

Health disparity highlights

Access to a dermatologic or plastic surgeon with expertise in the surgical treatment of large AKNs may be challenging but is needed to reduce risk for recurrence and adverse events.

Close-cropped haircuts on the occipital scalp, which are particularly popular among men of African descent, increase the risk for AKN.5 Although this grooming style may be a personal preference, other hairstyles commonly worn by those with tightly coiled hair may be deemed “unprofessional” in society or the workplace, which leads to hairstyling practices that may increase the risk for AKN.21

Acne keloidalis nuchae remains an understudied entity that adversely affects patients with skin of color.

References
  1. Ogunbiyi A. Acne keloidalis nuchae: prevalence, impact, and management challenges. Clin Cosmet Investig Dermatol. 2016;9:483-489. doi:10.2147/CCID.S99225 
  2. Al Aboud DM, Badri T. Acne keloidalis nuchae. In: StatPearls [Internet]. Updated July 31, 2023. Accessed August 2, 2024. https://www.ncbi.nlm.nih.gov/books/NBK459135/
  3. Sperling LC, Homoky C, Pratt L, et al. Acne keloidalis is a form of primary scarring alopecia. Arch Dermatol. 2000;136:479-484.
  4. Herzberg AJ, Dinehart SM, Kerns BJ, et al. Acne keloidalis: transverse microscopy, immunohistochemistry, and electron microscopy. Am J Dermatopathol. 1990;12:109-121. doi:10.1097/00000372-199004000-00001
  5. Saka B, Akakpo A-S, Téclessou JN, et al. Risk factors associated with acne keloidalis nuchae in black subjects: a case-control study. Ann Dermatol Venereol. 2020;147:350-354. doi:10.1016/j.annder.2020.01.007
  6. Umar S, Lee DJ, Lullo JJ. A retrospective cohort study and clinical classification system of acne keloidalis nuchae. J Clin Aesthet Dermatol. 2021;14:E61-E67.
  7. Reja M, Silverberg NB. Acne keloidalis nuchae. In: Silverberg NB, Durán-McKinster C, Tay YK, eds. Pediatric Skin of Color. Springer; 2015:141-145. doi:10.1007/978-1-4614-6654-3_16
  8. Knable AL Jr, Hanke CW, Gonin R. Prevalence of acne keloidalis nuchae in football players. J Am Acad Dermatol. 1997;37:570-574. doi:10.1016/s0190-9622(97)70173-7
  9. Umar S, Ton D, Carter MJ, et al. Unveiling a shared precursor condition for acne keloidalis nuchae and primary cicatricial alopecias. Clin Cosmet Investig Dermatol. 2023;16:2315-2327. doi:10.2147/CCID.S422310
  10. Na K, Oh SH, Kim SK. Acne keloidalis nuchae in Asian: a single institutional experience. PLoS One. 2017;12:e0189790. doi:10.1371/journal.pone.0189790
  11. Ogunbiyi A, George A. Acne keloidalis in females: case report and review of literature. J Natl Med Assoc. 2005;97:736-738. 
  12. Alexis A, Heath CR, Halder RM. Folliculitis keloidalis nuchae and pseudofolliculitis barbae: are prevention and effective treatment within reach? Dermatol Clin. 2014;32:183-191. doi:10.1016/j.det.2013.12.001
  13. Kridin K, Solomon A, Tzur-Bitan D, et al. Acne keloidalis nuchae and the metabolic syndrome: a population-based study. Am J Clin Dermatol. 2020;21:733-739. doi:10.1007/s40257-020-00541-z
  14. Smart K, Rodriguez I, Worswick S. Comorbidities and treatment options for acne keloidalis nuchae. Dermatol Ther. Published online May 25, 2024. doi:10.1155/2024/8336926
  15. Callender VD, Young CM, Haverstock CL, et al. An open label study of clobetasol propionate 0.05% and betamethasone valerate 0.12% foams in the treatment of mild to moderate acne keloidalis. Cutis. 2005;75:317-321.
  16. Adotama P, Grullon K, Ali S, et al. How we do it: our method for triamcinolone injections of acne keloidalis nuchae. Dermatol Surg. 2023;49:713-714. doi:10.1097/DSS.0000000000003803
  17. Beckett N, Lawson C, Cohen G. Electrosurgical excision of acne keloidalis nuchae with secondary intention healing. J Clin Aesthet Dermatol. 2011;4:36-39.
  18. Esmat SM, Abdel Hay RM, Abu Zeid OM, et al. The efficacy of laser-assisted hair removal in the treatment of acne keloidalis nuchae; a pilot study. Eur J Dermatol. 2012;22:645-650. doi:10.1684/ejd.2012.1830
  19. Dillard AD, Quarles FN. African-American pioneers in dermatology. In: Taylor SC, Kelly AP, Lim HW, et al, eds. Dermatology for Skin of Color. 2nd ed. McGraw-Hill Education; 2016:717-730.
  20. Umar S, David CV, Castillo JR, et al. Innovative surgical approaches and selection criteria of large acne keloidalis nuchae lesions. Plast Reconstr Surg Glob Open. 2019;7:E2215. doi:10.1097/GOX.0000000000002215
  21. Lee MS, Nambudiri VE. The CROWN act and dermatology: taking a stand against race-based hair discrimination. J Am Acad Dermatol. 2021;84:1181-1182. doi:10.1016/j.jaad.2020.11.065
Article PDF
FDP04109312.pdf
Issue
Federal Practitioner - 41(9)a
Publications
Federal Practitioner
Topics
Dermatology
Page Number
312-313
Sections
Clinical Review
Author(s)
Domenica Del Pozo, MD
Richard P. Usatine, MD
Candrice R. Heath, MD
Author(s)
Domenica Del Pozo, MD
Richard P. Usatine, MD
Candrice R. Heath, MD
Article PDF
FDP04109312.pdf
Article PDF
FDP04109312.pdf

Acne keloidalis nuchae (AKN) is a chronic inflammatory condition commonly affecting the occipital scalp and posterior neck. It causes discrete or extensive fibrosing papules that may coalesce to form pronounced ­tumorlike masses1,2 with scarring alopecia (Figure, A–C).3 Pustules, hair tufts, secondary bacterial infections, abscesses, and sinus tracts also may occur.1 The pathogenesis of AKN has been characterized as varying stages of follicular inflammation at the infundibular and isthmus levels followed by fibrotic occlusion of the ­follicular lumen.4 Pruritus, pain, bleeding, oozing, and a feeling of scalp tightness may occur.1,5

Umar et al6 performed a retrospective review of 108 men with AKN—58% of African descent, 37% Hispanic, 3% Asian, and 2% Middle Eastern—and proposed a 3-tier classification system for AKN. Tier 1 focused on the distribution and sagittal spread of AKN lesions between the clinical demarcation lines of the occipital notch and posterior hairline. Tier 2 focused on the type of lesions present—discrete papules or nodules, coalescing/abutting lesions, plaques (raised, atrophic, or indurated), or dome-shaped tumoral masses. Tier 3 focused on the presence or absence of co-existing dissecting cellulitis or folliculitis decalvans.6

Epidemiology

Acne keloidalis nuchae primarily manifests in adolescent and adult men of African or Afro-Caribbean descent.7 Among African American men, the prevalence of AKN ranges from 0.5% to 13.6%.8 Similar ranges have been reported among Nigerian, South African, and West African men.1 Acne keloidalis nuchae also affects Asian and Hispanic men but rarely is seen in non-Hispanic White men or in women of any ethnicity.9,10 The male to female ratio is 20:1.1,11 Hair texture, hairstyling practices such as closely shaved or faded haircuts, and genetics likely contribute to development of AKN. Sports and occupations that require the use of headgear or a tight collar may increase the risk for AKN.12

Key clinical features in people with darker skin tones

  • The lesions of AKN range in color from pink to dark brown or black. Postinflammatory hyperpigmentation or hyperchromia may be present around AKN lesions.
  • Chronicity of AKN may lead to extended use of high-potency topical or intralesional corticosteroids, which causes transient or long-lasting hypopigmentation, especially in those with darker skin tones.

Worth noting

  • Acne keloidalis nuchae can be disfiguring, which negatively impacts quality of life and self-esteem.12
  • Some occupations (eg, military, police) have hair policies that may not be favorable to those with or at risk for AKN.
  • Patients with AKN are 2 to 3 times more likely to present with metabolic syndrome, hypertension, type 2 diabetes mellitus, or obesity.13
 

 

Treatment

There are no treatments approved by the US Food and Drug Administration specifically for AKN. Treatment approaches are based on the pathophysiology, secondary impacts on the skin, and disease severity. Growing out the hair may prevent worsening and/or decrease the risk for new lesions.6

  • Options include but are not limited to topical and systemic therapies (eg, topical corticosteroids, oral or topical antibiotics, isotretinoin, topical retinoids, imiquimod, pimecrolimus), light devices (eg, phototherapy, laser), ablative therapies (eg, laser, cryotherapy, radiotherapy), and surgery (eg, excision, follicular unit excision), often in combination.6,14,15
  • Intralesional triamcinolone injections are considered standard of care. Adotama et al found that injecting ­triamcinolone into the deep dermis in the area of flat or papular AKN yielded better control of inflammation and decreased appearance of lesions compared with injecting individual lesions.16
  • For extensive AKN lesions that do not respond to ­less-invasive therapies, consider surgical techniques,6,17 such as follicular unit excision18 and more extensive surgical excisions building on approaches from pioneers Drs. John Kenney and Harold Pierce.19 An innovative surgical approach for removal of large AKNs is the bat excision technique—wound shape resembles a bat in a spread-eagled position—with secondary intention healing with or without debridement and/or tension sutures. The resulting linear scar acts as a new posterior hair line.20
 

 

Health disparity highlights

Access to a dermatologic or plastic surgeon with expertise in the surgical treatment of large AKNs may be challenging but is needed to reduce risk for recurrence and adverse events.

Close-cropped haircuts on the occipital scalp, which are particularly popular among men of African descent, increase the risk for AKN.5 Although this grooming style may be a personal preference, other hairstyles commonly worn by those with tightly coiled hair may be deemed “unprofessional” in society or the workplace, which leads to hairstyling practices that may increase the risk for AKN.21

Acne keloidalis nuchae remains an understudied entity that adversely affects patients with skin of color.

Acne keloidalis nuchae (AKN) is a chronic inflammatory condition commonly affecting the occipital scalp and posterior neck. It causes discrete or extensive fibrosing papules that may coalesce to form pronounced ­tumorlike masses1,2 with scarring alopecia (Figure, A–C).3 Pustules, hair tufts, secondary bacterial infections, abscesses, and sinus tracts also may occur.1 The pathogenesis of AKN has been characterized as varying stages of follicular inflammation at the infundibular and isthmus levels followed by fibrotic occlusion of the ­follicular lumen.4 Pruritus, pain, bleeding, oozing, and a feeling of scalp tightness may occur.1,5

Umar et al6 performed a retrospective review of 108 men with AKN—58% of African descent, 37% Hispanic, 3% Asian, and 2% Middle Eastern—and proposed a 3-tier classification system for AKN. Tier 1 focused on the distribution and sagittal spread of AKN lesions between the clinical demarcation lines of the occipital notch and posterior hairline. Tier 2 focused on the type of lesions present—discrete papules or nodules, coalescing/abutting lesions, plaques (raised, atrophic, or indurated), or dome-shaped tumoral masses. Tier 3 focused on the presence or absence of co-existing dissecting cellulitis or folliculitis decalvans.6

Epidemiology

Acne keloidalis nuchae primarily manifests in adolescent and adult men of African or Afro-Caribbean descent.7 Among African American men, the prevalence of AKN ranges from 0.5% to 13.6%.8 Similar ranges have been reported among Nigerian, South African, and West African men.1 Acne keloidalis nuchae also affects Asian and Hispanic men but rarely is seen in non-Hispanic White men or in women of any ethnicity.9,10 The male to female ratio is 20:1.1,11 Hair texture, hairstyling practices such as closely shaved or faded haircuts, and genetics likely contribute to development of AKN. Sports and occupations that require the use of headgear or a tight collar may increase the risk for AKN.12

Key clinical features in people with darker skin tones

  • The lesions of AKN range in color from pink to dark brown or black. Postinflammatory hyperpigmentation or hyperchromia may be present around AKN lesions.
  • Chronicity of AKN may lead to extended use of high-potency topical or intralesional corticosteroids, which causes transient or long-lasting hypopigmentation, especially in those with darker skin tones.

Worth noting

  • Acne keloidalis nuchae can be disfiguring, which negatively impacts quality of life and self-esteem.12
  • Some occupations (eg, military, police) have hair policies that may not be favorable to those with or at risk for AKN.
  • Patients with AKN are 2 to 3 times more likely to present with metabolic syndrome, hypertension, type 2 diabetes mellitus, or obesity.13
 

 

Treatment

There are no treatments approved by the US Food and Drug Administration specifically for AKN. Treatment approaches are based on the pathophysiology, secondary impacts on the skin, and disease severity. Growing out the hair may prevent worsening and/or decrease the risk for new lesions.6

  • Options include but are not limited to topical and systemic therapies (eg, topical corticosteroids, oral or topical antibiotics, isotretinoin, topical retinoids, imiquimod, pimecrolimus), light devices (eg, phototherapy, laser), ablative therapies (eg, laser, cryotherapy, radiotherapy), and surgery (eg, excision, follicular unit excision), often in combination.6,14,15
  • Intralesional triamcinolone injections are considered standard of care. Adotama et al found that injecting ­triamcinolone into the deep dermis in the area of flat or papular AKN yielded better control of inflammation and decreased appearance of lesions compared with injecting individual lesions.16
  • For extensive AKN lesions that do not respond to ­less-invasive therapies, consider surgical techniques,6,17 such as follicular unit excision18 and more extensive surgical excisions building on approaches from pioneers Drs. John Kenney and Harold Pierce.19 An innovative surgical approach for removal of large AKNs is the bat excision technique—wound shape resembles a bat in a spread-eagled position—with secondary intention healing with or without debridement and/or tension sutures. The resulting linear scar acts as a new posterior hair line.20
 

 

Health disparity highlights

Access to a dermatologic or plastic surgeon with expertise in the surgical treatment of large AKNs may be challenging but is needed to reduce risk for recurrence and adverse events.

Close-cropped haircuts on the occipital scalp, which are particularly popular among men of African descent, increase the risk for AKN.5 Although this grooming style may be a personal preference, other hairstyles commonly worn by those with tightly coiled hair may be deemed “unprofessional” in society or the workplace, which leads to hairstyling practices that may increase the risk for AKN.21

Acne keloidalis nuchae remains an understudied entity that adversely affects patients with skin of color.

References
  1. Ogunbiyi A. Acne keloidalis nuchae: prevalence, impact, and management challenges. Clin Cosmet Investig Dermatol. 2016;9:483-489. doi:10.2147/CCID.S99225 
  2. Al Aboud DM, Badri T. Acne keloidalis nuchae. In: StatPearls [Internet]. Updated July 31, 2023. Accessed August 2, 2024. https://www.ncbi.nlm.nih.gov/books/NBK459135/
  3. Sperling LC, Homoky C, Pratt L, et al. Acne keloidalis is a form of primary scarring alopecia. Arch Dermatol. 2000;136:479-484.
  4. Herzberg AJ, Dinehart SM, Kerns BJ, et al. Acne keloidalis: transverse microscopy, immunohistochemistry, and electron microscopy. Am J Dermatopathol. 1990;12:109-121. doi:10.1097/00000372-199004000-00001
  5. Saka B, Akakpo A-S, Téclessou JN, et al. Risk factors associated with acne keloidalis nuchae in black subjects: a case-control study. Ann Dermatol Venereol. 2020;147:350-354. doi:10.1016/j.annder.2020.01.007
  6. Umar S, Lee DJ, Lullo JJ. A retrospective cohort study and clinical classification system of acne keloidalis nuchae. J Clin Aesthet Dermatol. 2021;14:E61-E67.
  7. Reja M, Silverberg NB. Acne keloidalis nuchae. In: Silverberg NB, Durán-McKinster C, Tay YK, eds. Pediatric Skin of Color. Springer; 2015:141-145. doi:10.1007/978-1-4614-6654-3_16
  8. Knable AL Jr, Hanke CW, Gonin R. Prevalence of acne keloidalis nuchae in football players. J Am Acad Dermatol. 1997;37:570-574. doi:10.1016/s0190-9622(97)70173-7
  9. Umar S, Ton D, Carter MJ, et al. Unveiling a shared precursor condition for acne keloidalis nuchae and primary cicatricial alopecias. Clin Cosmet Investig Dermatol. 2023;16:2315-2327. doi:10.2147/CCID.S422310
  10. Na K, Oh SH, Kim SK. Acne keloidalis nuchae in Asian: a single institutional experience. PLoS One. 2017;12:e0189790. doi:10.1371/journal.pone.0189790
  11. Ogunbiyi A, George A. Acne keloidalis in females: case report and review of literature. J Natl Med Assoc. 2005;97:736-738. 
  12. Alexis A, Heath CR, Halder RM. Folliculitis keloidalis nuchae and pseudofolliculitis barbae: are prevention and effective treatment within reach? Dermatol Clin. 2014;32:183-191. doi:10.1016/j.det.2013.12.001
  13. Kridin K, Solomon A, Tzur-Bitan D, et al. Acne keloidalis nuchae and the metabolic syndrome: a population-based study. Am J Clin Dermatol. 2020;21:733-739. doi:10.1007/s40257-020-00541-z
  14. Smart K, Rodriguez I, Worswick S. Comorbidities and treatment options for acne keloidalis nuchae. Dermatol Ther. Published online May 25, 2024. doi:10.1155/2024/8336926
  15. Callender VD, Young CM, Haverstock CL, et al. An open label study of clobetasol propionate 0.05% and betamethasone valerate 0.12% foams in the treatment of mild to moderate acne keloidalis. Cutis. 2005;75:317-321.
  16. Adotama P, Grullon K, Ali S, et al. How we do it: our method for triamcinolone injections of acne keloidalis nuchae. Dermatol Surg. 2023;49:713-714. doi:10.1097/DSS.0000000000003803
  17. Beckett N, Lawson C, Cohen G. Electrosurgical excision of acne keloidalis nuchae with secondary intention healing. J Clin Aesthet Dermatol. 2011;4:36-39.
  18. Esmat SM, Abdel Hay RM, Abu Zeid OM, et al. The efficacy of laser-assisted hair removal in the treatment of acne keloidalis nuchae; a pilot study. Eur J Dermatol. 2012;22:645-650. doi:10.1684/ejd.2012.1830
  19. Dillard AD, Quarles FN. African-American pioneers in dermatology. In: Taylor SC, Kelly AP, Lim HW, et al, eds. Dermatology for Skin of Color. 2nd ed. McGraw-Hill Education; 2016:717-730.
  20. Umar S, David CV, Castillo JR, et al. Innovative surgical approaches and selection criteria of large acne keloidalis nuchae lesions. Plast Reconstr Surg Glob Open. 2019;7:E2215. doi:10.1097/GOX.0000000000002215
  21. Lee MS, Nambudiri VE. The CROWN act and dermatology: taking a stand against race-based hair discrimination. J Am Acad Dermatol. 2021;84:1181-1182. doi:10.1016/j.jaad.2020.11.065
References
  1. Ogunbiyi A. Acne keloidalis nuchae: prevalence, impact, and management challenges. Clin Cosmet Investig Dermatol. 2016;9:483-489. doi:10.2147/CCID.S99225 
  2. Al Aboud DM, Badri T. Acne keloidalis nuchae. In: StatPearls [Internet]. Updated July 31, 2023. Accessed August 2, 2024. https://www.ncbi.nlm.nih.gov/books/NBK459135/
  3. Sperling LC, Homoky C, Pratt L, et al. Acne keloidalis is a form of primary scarring alopecia. Arch Dermatol. 2000;136:479-484.
  4. Herzberg AJ, Dinehart SM, Kerns BJ, et al. Acne keloidalis: transverse microscopy, immunohistochemistry, and electron microscopy. Am J Dermatopathol. 1990;12:109-121. doi:10.1097/00000372-199004000-00001
  5. Saka B, Akakpo A-S, Téclessou JN, et al. Risk factors associated with acne keloidalis nuchae in black subjects: a case-control study. Ann Dermatol Venereol. 2020;147:350-354. doi:10.1016/j.annder.2020.01.007
  6. Umar S, Lee DJ, Lullo JJ. A retrospective cohort study and clinical classification system of acne keloidalis nuchae. J Clin Aesthet Dermatol. 2021;14:E61-E67.
  7. Reja M, Silverberg NB. Acne keloidalis nuchae. In: Silverberg NB, Durán-McKinster C, Tay YK, eds. Pediatric Skin of Color. Springer; 2015:141-145. doi:10.1007/978-1-4614-6654-3_16
  8. Knable AL Jr, Hanke CW, Gonin R. Prevalence of acne keloidalis nuchae in football players. J Am Acad Dermatol. 1997;37:570-574. doi:10.1016/s0190-9622(97)70173-7
  9. Umar S, Ton D, Carter MJ, et al. Unveiling a shared precursor condition for acne keloidalis nuchae and primary cicatricial alopecias. Clin Cosmet Investig Dermatol. 2023;16:2315-2327. doi:10.2147/CCID.S422310
  10. Na K, Oh SH, Kim SK. Acne keloidalis nuchae in Asian: a single institutional experience. PLoS One. 2017;12:e0189790. doi:10.1371/journal.pone.0189790
  11. Ogunbiyi A, George A. Acne keloidalis in females: case report and review of literature. J Natl Med Assoc. 2005;97:736-738. 
  12. Alexis A, Heath CR, Halder RM. Folliculitis keloidalis nuchae and pseudofolliculitis barbae: are prevention and effective treatment within reach? Dermatol Clin. 2014;32:183-191. doi:10.1016/j.det.2013.12.001
  13. Kridin K, Solomon A, Tzur-Bitan D, et al. Acne keloidalis nuchae and the metabolic syndrome: a population-based study. Am J Clin Dermatol. 2020;21:733-739. doi:10.1007/s40257-020-00541-z
  14. Smart K, Rodriguez I, Worswick S. Comorbidities and treatment options for acne keloidalis nuchae. Dermatol Ther. Published online May 25, 2024. doi:10.1155/2024/8336926
  15. Callender VD, Young CM, Haverstock CL, et al. An open label study of clobetasol propionate 0.05% and betamethasone valerate 0.12% foams in the treatment of mild to moderate acne keloidalis. Cutis. 2005;75:317-321.
  16. Adotama P, Grullon K, Ali S, et al. How we do it: our method for triamcinolone injections of acne keloidalis nuchae. Dermatol Surg. 2023;49:713-714. doi:10.1097/DSS.0000000000003803
  17. Beckett N, Lawson C, Cohen G. Electrosurgical excision of acne keloidalis nuchae with secondary intention healing. J Clin Aesthet Dermatol. 2011;4:36-39.
  18. Esmat SM, Abdel Hay RM, Abu Zeid OM, et al. The efficacy of laser-assisted hair removal in the treatment of acne keloidalis nuchae; a pilot study. Eur J Dermatol. 2012;22:645-650. doi:10.1684/ejd.2012.1830
  19. Dillard AD, Quarles FN. African-American pioneers in dermatology. In: Taylor SC, Kelly AP, Lim HW, et al, eds. Dermatology for Skin of Color. 2nd ed. McGraw-Hill Education; 2016:717-730.
  20. Umar S, David CV, Castillo JR, et al. Innovative surgical approaches and selection criteria of large acne keloidalis nuchae lesions. Plast Reconstr Surg Glob Open. 2019;7:E2215. doi:10.1097/GOX.0000000000002215
  21. Lee MS, Nambudiri VE. The CROWN act and dermatology: taking a stand against race-based hair discrimination. J Am Acad Dermatol. 2021;84:1181-1182. doi:10.1016/j.jaad.2020.11.065
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