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NEW YORK – Nail discoloration, in all its variety, has a wide differential. And while that differential narrows when a patient presents with concerns about nails with red discoloration, there’s still a long list of diagnoses to consider.
During a nail-focused session at the American Academy of Dermatology summer meeting, Shari Lipner, MD, PhD, took attendees through a presentation-based approach that gets to the root etiology of erythronychia and guides diagnosis and treatment options.
“However, regardless of the etiology, erythronychia shares a common pathogenesis,” said Dr. Lipner, a dermatologist at New York–Presbyterian Hospital and Weil Cornell Medicine. The process begins in the distal nail matrix, resulting in a thin long strip of ventral nail becoming discolored, with the nail bed filling in the concavity. The engorged nail bed also makes the affected nail unit prone to splinter hemorrhages, and the thinned, transparent nail makes the erythema more visible, she explained.
Polydactylous longitudinal erythronychia
For erythronychia affecting several nails, onychotillomania is among the possible causes. This condition “often goes hand in hand with onychophagia,” and trichotillomania, skin-picking, or other self-mutilating disorders may also be present, she said. In both the adult and pediatric population, onychotillomania can accompany psychiatric disorders, including depression and obsessive-compulsive disorder, and may be associated with suicidal ideation, she added.
When onychotillomania is the cause, erythronychia may be accompanied by paronychia, and patients will often have a shortened nail bed and an atrophic nail plate. Dorsal pterygium may also be present.
Dermoscopy can provide some clues that onychotillomania is the culprit, said Dr. Lipner, citing a study that looked at dermoscopic images of 36 cases, which found scales in 94%, absence of the nail plate in 83%, and characteristic wavy lines in 69% (J Am Acad Dermatol. 2018 Oct;79[4]:702-5). Other frequent dermoscopy findings included hemorrhages (64%), crusts (61%), nail bed pigmentation (47%), and speckled dots (39%).
Lichen planus can also affect the nails, with erythronychia among its manifestations, she noted. Though lichen planus is thought of as a disease of middle or older age, usually affecting those aged 50-70 years, “15% of those affected are less than 20 years old,” she said.
The erythronychia of lichen planus is often accompanied by longitudinal riding, splitting, and atrophy of the nail plate, she said. Pterygium can also be present, representing a scar in the nail matrix. Dermatopathology will reveal a patchy, bandlike lichenoid infiltrate, with variable sawtooth hypergranulosis and hyperplasia.
“There’s not much evidence about how to treat lichen planus of the nails,” noted Dr. Lipner. Options can include intralesional corticosteroid injections at the nail matrix, topical corticosteroids, oral methotrexate, and retinoids.
Darier disease, an inherited condition caused by mutations in ATP2A2, has both skin and nail manifestations. Characteristic skin signs include hyperkeratotic papules, cobblestone papules, and palmar pits, she said. When nails are affected – as they are in up to 95% of Darier disease patients – they can have a characteristic “candy cane” appearance, with bands of longitudinal erythronychia alternating with normal-colored nail. The nails can also have V-shaped notching, she added.
Patients with systemic lupus erythematosus can also have longitudinal erythronychia; here, dermoscopy will show the characteristic prominent capillary loops in the proximal nail folds, she said.
Foreign substances such as nail polish and dyes, when they’re the source of erythronychia in one or several nails, can usually be wiped off with alcohol or acetone; also, “the proximal margin of discoloration will follow the same pattern as the nail fold,” said Dr. Lipner.
Localized longitudinal erythronychia
When the red discoloration is limited to a single nail, the differential shifts, said Dr. Lipner. With a hematoma, there’s often a history of trauma, and dermoscopy will show characteristic globules and streaks.
The first clue that erythronychia caused by onychopapilloma can be seen at the lunula: There will often be a comet- or pencil-shaped point to the discoloration in that region. But, she said, “the key is to do dermoscopy at the free edge of the nail plate. In 100 percent of cases, there will be a subungual hyperkeratotic papule” that will solidify the diagnosis.
Histopathology of onychopapillomas – a relatively recently recognized entity – will show nail bed and distal matrix acanthosis, with the distal nail bed showing matrix metaplasia, Dr. Lipner said.
Glomus tumors arise from cells of the glomus body, a specialized vascular apparatus that is involved in temperature regulation. “These structures are abundant in the digits and the subungual region,” said Dr. Lipner, which means that glomus tumors – a benign lesion – may develop subungually. Glomus tumors can be idiopathic, but she added, “think neurofibromatosis type 1 if you see multiple glomus tumors.”
Glomus tumors will present with longitudinal erythronychia, with a distal split of the nail sometimes accompanying the discoloration. A round bluish to gray nodule can also be seen. A thorough history and exam can help solidify the diagnosis, said Dr. Lipner; there’s a characteristic triad of point tenderness with the application of pressure to the nail, pain, and cold hypersensitivity.
Classically, the point tenderness is assessed by Love’s test, which elicits severe pain when the subungual tumor is pressed with a small object like the end of paper clip or a ballpoint pen. Application of a tourniquet to the arm after elevation, termed Hildreth’s test, should alleviate subungual glomus tumor pain, and release of the tourniquet causes an abrupt and marked recurrence of pain. Immersing the patient’s affected hand in cold water also increases glomus tumor pain.
“Imaging can be quite helpful” to confirm a glomus tumor diagnosis, said Dr. Lipner. “X-ray is cheap, and you can see erosions in 50% of patients.” However, she added, doppler ultrasound and magnetic resonance imaging are more sensitive, detecting tumors as small as 2 mm.
“Biopsy with histopathology is the gold standard in making the diagnosis” of glomus tumor, though, she noted. Pathologic examination will show monomorphic cells with small caliber vascular channels.
Malignancy is actually uncommon with erythronychia, though it’s always in the differential diagnosis, she said.
In one case series examining subungual squamous cell carcinomas, common findings included onycholysis and localized hyperkeratosis, along with longitudinal erythronychia. “This may be subtle; splinter hemorrhages can also be present,” noted Dr. Lipner, adding, “If there are any symptoms, or an evolving band, a biopsy is indicated.”
“Even with erythronychia, the presentation can be quite variable,” she said. Nail unit melanoma can count erythronychia among the presenting signs. Clues that should raise suspicion for melanoma can include a wide band and prominent onycholysis, especially distal onycholysis and splintering. Again, she said, “biopsy with histopathology is the gold standard in making the diagnosis”; any symptoms or evidence of an evolving band should trigger a biopsy.
Dr. Lipner had no conflicts of interest relevant to her presentation.
SOURCE: Lipner S. Summer AAD 2019, Presentation F035.
NEW YORK – Nail discoloration, in all its variety, has a wide differential. And while that differential narrows when a patient presents with concerns about nails with red discoloration, there’s still a long list of diagnoses to consider.
During a nail-focused session at the American Academy of Dermatology summer meeting, Shari Lipner, MD, PhD, took attendees through a presentation-based approach that gets to the root etiology of erythronychia and guides diagnosis and treatment options.
“However, regardless of the etiology, erythronychia shares a common pathogenesis,” said Dr. Lipner, a dermatologist at New York–Presbyterian Hospital and Weil Cornell Medicine. The process begins in the distal nail matrix, resulting in a thin long strip of ventral nail becoming discolored, with the nail bed filling in the concavity. The engorged nail bed also makes the affected nail unit prone to splinter hemorrhages, and the thinned, transparent nail makes the erythema more visible, she explained.
Polydactylous longitudinal erythronychia
For erythronychia affecting several nails, onychotillomania is among the possible causes. This condition “often goes hand in hand with onychophagia,” and trichotillomania, skin-picking, or other self-mutilating disorders may also be present, she said. In both the adult and pediatric population, onychotillomania can accompany psychiatric disorders, including depression and obsessive-compulsive disorder, and may be associated with suicidal ideation, she added.
When onychotillomania is the cause, erythronychia may be accompanied by paronychia, and patients will often have a shortened nail bed and an atrophic nail plate. Dorsal pterygium may also be present.
Dermoscopy can provide some clues that onychotillomania is the culprit, said Dr. Lipner, citing a study that looked at dermoscopic images of 36 cases, which found scales in 94%, absence of the nail plate in 83%, and characteristic wavy lines in 69% (J Am Acad Dermatol. 2018 Oct;79[4]:702-5). Other frequent dermoscopy findings included hemorrhages (64%), crusts (61%), nail bed pigmentation (47%), and speckled dots (39%).
Lichen planus can also affect the nails, with erythronychia among its manifestations, she noted. Though lichen planus is thought of as a disease of middle or older age, usually affecting those aged 50-70 years, “15% of those affected are less than 20 years old,” she said.
The erythronychia of lichen planus is often accompanied by longitudinal riding, splitting, and atrophy of the nail plate, she said. Pterygium can also be present, representing a scar in the nail matrix. Dermatopathology will reveal a patchy, bandlike lichenoid infiltrate, with variable sawtooth hypergranulosis and hyperplasia.
“There’s not much evidence about how to treat lichen planus of the nails,” noted Dr. Lipner. Options can include intralesional corticosteroid injections at the nail matrix, topical corticosteroids, oral methotrexate, and retinoids.
Darier disease, an inherited condition caused by mutations in ATP2A2, has both skin and nail manifestations. Characteristic skin signs include hyperkeratotic papules, cobblestone papules, and palmar pits, she said. When nails are affected – as they are in up to 95% of Darier disease patients – they can have a characteristic “candy cane” appearance, with bands of longitudinal erythronychia alternating with normal-colored nail. The nails can also have V-shaped notching, she added.
Patients with systemic lupus erythematosus can also have longitudinal erythronychia; here, dermoscopy will show the characteristic prominent capillary loops in the proximal nail folds, she said.
Foreign substances such as nail polish and dyes, when they’re the source of erythronychia in one or several nails, can usually be wiped off with alcohol or acetone; also, “the proximal margin of discoloration will follow the same pattern as the nail fold,” said Dr. Lipner.
Localized longitudinal erythronychia
When the red discoloration is limited to a single nail, the differential shifts, said Dr. Lipner. With a hematoma, there’s often a history of trauma, and dermoscopy will show characteristic globules and streaks.
The first clue that erythronychia caused by onychopapilloma can be seen at the lunula: There will often be a comet- or pencil-shaped point to the discoloration in that region. But, she said, “the key is to do dermoscopy at the free edge of the nail plate. In 100 percent of cases, there will be a subungual hyperkeratotic papule” that will solidify the diagnosis.
Histopathology of onychopapillomas – a relatively recently recognized entity – will show nail bed and distal matrix acanthosis, with the distal nail bed showing matrix metaplasia, Dr. Lipner said.
Glomus tumors arise from cells of the glomus body, a specialized vascular apparatus that is involved in temperature regulation. “These structures are abundant in the digits and the subungual region,” said Dr. Lipner, which means that glomus tumors – a benign lesion – may develop subungually. Glomus tumors can be idiopathic, but she added, “think neurofibromatosis type 1 if you see multiple glomus tumors.”
Glomus tumors will present with longitudinal erythronychia, with a distal split of the nail sometimes accompanying the discoloration. A round bluish to gray nodule can also be seen. A thorough history and exam can help solidify the diagnosis, said Dr. Lipner; there’s a characteristic triad of point tenderness with the application of pressure to the nail, pain, and cold hypersensitivity.
Classically, the point tenderness is assessed by Love’s test, which elicits severe pain when the subungual tumor is pressed with a small object like the end of paper clip or a ballpoint pen. Application of a tourniquet to the arm after elevation, termed Hildreth’s test, should alleviate subungual glomus tumor pain, and release of the tourniquet causes an abrupt and marked recurrence of pain. Immersing the patient’s affected hand in cold water also increases glomus tumor pain.
“Imaging can be quite helpful” to confirm a glomus tumor diagnosis, said Dr. Lipner. “X-ray is cheap, and you can see erosions in 50% of patients.” However, she added, doppler ultrasound and magnetic resonance imaging are more sensitive, detecting tumors as small as 2 mm.
“Biopsy with histopathology is the gold standard in making the diagnosis” of glomus tumor, though, she noted. Pathologic examination will show monomorphic cells with small caliber vascular channels.
Malignancy is actually uncommon with erythronychia, though it’s always in the differential diagnosis, she said.
In one case series examining subungual squamous cell carcinomas, common findings included onycholysis and localized hyperkeratosis, along with longitudinal erythronychia. “This may be subtle; splinter hemorrhages can also be present,” noted Dr. Lipner, adding, “If there are any symptoms, or an evolving band, a biopsy is indicated.”
“Even with erythronychia, the presentation can be quite variable,” she said. Nail unit melanoma can count erythronychia among the presenting signs. Clues that should raise suspicion for melanoma can include a wide band and prominent onycholysis, especially distal onycholysis and splintering. Again, she said, “biopsy with histopathology is the gold standard in making the diagnosis”; any symptoms or evidence of an evolving band should trigger a biopsy.
Dr. Lipner had no conflicts of interest relevant to her presentation.
SOURCE: Lipner S. Summer AAD 2019, Presentation F035.
NEW YORK – Nail discoloration, in all its variety, has a wide differential. And while that differential narrows when a patient presents with concerns about nails with red discoloration, there’s still a long list of diagnoses to consider.
During a nail-focused session at the American Academy of Dermatology summer meeting, Shari Lipner, MD, PhD, took attendees through a presentation-based approach that gets to the root etiology of erythronychia and guides diagnosis and treatment options.
“However, regardless of the etiology, erythronychia shares a common pathogenesis,” said Dr. Lipner, a dermatologist at New York–Presbyterian Hospital and Weil Cornell Medicine. The process begins in the distal nail matrix, resulting in a thin long strip of ventral nail becoming discolored, with the nail bed filling in the concavity. The engorged nail bed also makes the affected nail unit prone to splinter hemorrhages, and the thinned, transparent nail makes the erythema more visible, she explained.
Polydactylous longitudinal erythronychia
For erythronychia affecting several nails, onychotillomania is among the possible causes. This condition “often goes hand in hand with onychophagia,” and trichotillomania, skin-picking, or other self-mutilating disorders may also be present, she said. In both the adult and pediatric population, onychotillomania can accompany psychiatric disorders, including depression and obsessive-compulsive disorder, and may be associated with suicidal ideation, she added.
When onychotillomania is the cause, erythronychia may be accompanied by paronychia, and patients will often have a shortened nail bed and an atrophic nail plate. Dorsal pterygium may also be present.
Dermoscopy can provide some clues that onychotillomania is the culprit, said Dr. Lipner, citing a study that looked at dermoscopic images of 36 cases, which found scales in 94%, absence of the nail plate in 83%, and characteristic wavy lines in 69% (J Am Acad Dermatol. 2018 Oct;79[4]:702-5). Other frequent dermoscopy findings included hemorrhages (64%), crusts (61%), nail bed pigmentation (47%), and speckled dots (39%).
Lichen planus can also affect the nails, with erythronychia among its manifestations, she noted. Though lichen planus is thought of as a disease of middle or older age, usually affecting those aged 50-70 years, “15% of those affected are less than 20 years old,” she said.
The erythronychia of lichen planus is often accompanied by longitudinal riding, splitting, and atrophy of the nail plate, she said. Pterygium can also be present, representing a scar in the nail matrix. Dermatopathology will reveal a patchy, bandlike lichenoid infiltrate, with variable sawtooth hypergranulosis and hyperplasia.
“There’s not much evidence about how to treat lichen planus of the nails,” noted Dr. Lipner. Options can include intralesional corticosteroid injections at the nail matrix, topical corticosteroids, oral methotrexate, and retinoids.
Darier disease, an inherited condition caused by mutations in ATP2A2, has both skin and nail manifestations. Characteristic skin signs include hyperkeratotic papules, cobblestone papules, and palmar pits, she said. When nails are affected – as they are in up to 95% of Darier disease patients – they can have a characteristic “candy cane” appearance, with bands of longitudinal erythronychia alternating with normal-colored nail. The nails can also have V-shaped notching, she added.
Patients with systemic lupus erythematosus can also have longitudinal erythronychia; here, dermoscopy will show the characteristic prominent capillary loops in the proximal nail folds, she said.
Foreign substances such as nail polish and dyes, when they’re the source of erythronychia in one or several nails, can usually be wiped off with alcohol or acetone; also, “the proximal margin of discoloration will follow the same pattern as the nail fold,” said Dr. Lipner.
Localized longitudinal erythronychia
When the red discoloration is limited to a single nail, the differential shifts, said Dr. Lipner. With a hematoma, there’s often a history of trauma, and dermoscopy will show characteristic globules and streaks.
The first clue that erythronychia caused by onychopapilloma can be seen at the lunula: There will often be a comet- or pencil-shaped point to the discoloration in that region. But, she said, “the key is to do dermoscopy at the free edge of the nail plate. In 100 percent of cases, there will be a subungual hyperkeratotic papule” that will solidify the diagnosis.
Histopathology of onychopapillomas – a relatively recently recognized entity – will show nail bed and distal matrix acanthosis, with the distal nail bed showing matrix metaplasia, Dr. Lipner said.
Glomus tumors arise from cells of the glomus body, a specialized vascular apparatus that is involved in temperature regulation. “These structures are abundant in the digits and the subungual region,” said Dr. Lipner, which means that glomus tumors – a benign lesion – may develop subungually. Glomus tumors can be idiopathic, but she added, “think neurofibromatosis type 1 if you see multiple glomus tumors.”
Glomus tumors will present with longitudinal erythronychia, with a distal split of the nail sometimes accompanying the discoloration. A round bluish to gray nodule can also be seen. A thorough history and exam can help solidify the diagnosis, said Dr. Lipner; there’s a characteristic triad of point tenderness with the application of pressure to the nail, pain, and cold hypersensitivity.
Classically, the point tenderness is assessed by Love’s test, which elicits severe pain when the subungual tumor is pressed with a small object like the end of paper clip or a ballpoint pen. Application of a tourniquet to the arm after elevation, termed Hildreth’s test, should alleviate subungual glomus tumor pain, and release of the tourniquet causes an abrupt and marked recurrence of pain. Immersing the patient’s affected hand in cold water also increases glomus tumor pain.
“Imaging can be quite helpful” to confirm a glomus tumor diagnosis, said Dr. Lipner. “X-ray is cheap, and you can see erosions in 50% of patients.” However, she added, doppler ultrasound and magnetic resonance imaging are more sensitive, detecting tumors as small as 2 mm.
“Biopsy with histopathology is the gold standard in making the diagnosis” of glomus tumor, though, she noted. Pathologic examination will show monomorphic cells with small caliber vascular channels.
Malignancy is actually uncommon with erythronychia, though it’s always in the differential diagnosis, she said.
In one case series examining subungual squamous cell carcinomas, common findings included onycholysis and localized hyperkeratosis, along with longitudinal erythronychia. “This may be subtle; splinter hemorrhages can also be present,” noted Dr. Lipner, adding, “If there are any symptoms, or an evolving band, a biopsy is indicated.”
“Even with erythronychia, the presentation can be quite variable,” she said. Nail unit melanoma can count erythronychia among the presenting signs. Clues that should raise suspicion for melanoma can include a wide band and prominent onycholysis, especially distal onycholysis and splintering. Again, she said, “biopsy with histopathology is the gold standard in making the diagnosis”; any symptoms or evidence of an evolving band should trigger a biopsy.
Dr. Lipner had no conflicts of interest relevant to her presentation.
SOURCE: Lipner S. Summer AAD 2019, Presentation F035.
EXPERT ANALYSIS FROM SUMMER AAD 2019