Dermatologic Disorders

This article is part of a series describing and differentiating dermatologic lumps and bumps. In Part 37, Leung and colleagues describe keratosis pilaris. To access previously published articles in the...

Steatocystoma multiplex is a rare skin condition clinically characterized by multiple, asymptomatic, smooth, round, soft to firm, often freely movable, yellow or skin-colored papules and nodules.

This article is part of a series describing and differentiating dermatologic lumps and bumps. In Part 38, Leung and colleagues describe lichen striatus. To access previously published articles in the...

Diffuse cutaneous mastocytosis, a rare but potentially fatal form of cutaneous mastocytosis, accounts for approximately 1% to 5% of pediatric cutaneous mastocytosis cases

This article is part of a series describing and differentiating dermatologic lumps and bumps. In Part 41, Leung and colleagues describe congenital melanocytic nevi. To access previously published articles...

Maculopapular cutaneous mastocytosis (also known as urticaria pigmentosa) is the most common form of cutaneous mastocytosis and accounts for 70% to 90% of pediatric cases. Its incidence has been estimated...

This article is part of a series describing and differentiating dermatologic lumps and bumps. In Part 43, Leung and colleagues describe blue nevi. To access previously published articles in the series,...

Mastocytosis is a rare heterogenous group of disorders characterized by a clonal proliferation and accumulation of mast cells in one or more organs, mostly skin and bone marrow and, less frequently,...

A popliteal cyst, also known as a Baker cyst or parameniscal cyst, forms when the synovial fluid from the knee joint fills and distends a preexisting gastrocnemius-semimembranosus bursa in the popliteal...

A ganglion cyst is a benign cystic swelling that typically arises from the synovium of either a tendon sheath or a joint capsule.