Joseph M. Lam, MD

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

Dermatosis papulosa nigra is a common, benign epidermal growth characterized by the presence of multiple, asymptomatic, hyperpigmented, round, dome-shaped or flat, papules or macules localized predominately...

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 14, parulis and traumatic fibroma of the tongue are described.

This article is part of a series describing and differentiating dermatologic lumps and bumps. In part 15, accessory tragus and frostbitten ears are described.

This article is part of a series describing and differentiating dermatologic lumps and bumps. In part 16, cystic hygroma is described.

A 3-year-old boy presented to an outpatient clinic with a history of painless edema involving both lower extremities since birth.

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,...

This article is part of a series describing and differentiating dermatologic lumps and bumps. In Part 42, Leung and colleagues describe acquired melanocytic nevi. To access previously published articles in...

This article is part of a series describing and differentiating dermatologic lumps and bumps. In Part 32, Leung and colleagues describe linear epidermal nevus. To access previously published articles in the...