JAMA Dermatology

Hyperpigmented Plaques at Insulin Injection Sites

A woman in her 50s with type 2 diabetes presented with hyperpigmented plaques on her abdomen. Physical examination revealed symmetric, hyperkeratotic, verrucous plaques with thick, brownish, firmly adhered crusts. What is your diagnosis?

Best Practices for Managing Pseudofolliculitis Barbae – An Expert Consensus Delphi Study

Importance  Pseudofolliculitis barbae (PFB) is a chronic inflammatory disease caused by penetration of a shaved, curved hair shaft into the skin. Standardized recommendations for diagnosing and managing PFB are needed. Objective  To establish expert consensus recommendations outlining best practices for…

Elephantiasic Pretibial Myxedema

This case report describes a man with enlargement of the lower legs with pink nodules and malodor.

Generalized Linear Keratotic Papules in a Man in His 30s

A man in his 30s presented with a 5-year history of generalized keratotic papules and plaques accompanied by pruritus. Physical examination revealed numerous dark-red keratotic papules on the trunk and extremities as well as seborrheic dermatitislike erythematous scaly patches on…

Diffuse Pruritic Maculopapular Rash With Pitted Necrosis

A previously healthy woman in her 30s presented with a diffuse maculopapular rash, most prominently on her legs, with pitted necrotic spots, black eschar, and serous fluid weeping with diffuse edema. Histopathology showed areas with abnormal aggregates composed almost entirely…

Pancreatic Panniculitis in a Patient With Lung Cancer

This case report describes a woman in her 50s with metastatic lung adenocarcinoma who presented with a 4-week history of severe arthralgias and painful nodules on her skin.

Parry-Romberg Syndrome With Concurrent en Coup de Sabre

This case report describes a young man who presented with a long history of progressive right hemifacial deformity and a streak of scarring alopecia from eyebrow to scalp.

Cobblestoning Monomorphic Papules of the Lower Extremities

A 62-year-old Vietnamese man with a history of hepatitis B presented with a chronic, generalized pruritic rash that involved the back, trunk, and upper and lower extremities. What is your diagnosis?

Prurigo Pigmentosa Associated With Ketogenic Diet

This case report describes a man with recurrent pruritic papulovesicular eruptions who reported practicing intermittent fasting and adhering to a ketogenic diet.