By Gary M. White, MD

Fistula, Sinus Tract

Pilonidal Cyst
Pilonidal Cyst


Psoriasis. Note the uniform redness in contrast to Tinea Corporis (below).
Psoriasis of the Gluteal Cleft

Tinea Corporis. Note the active border in comparison to Psoriasis (above).
Tinea Corporis


Coccygeal Pad. An acquired nodule on the coccyx of a 15-year-old boy. For a picture, see [Dermatologica Sinica March 2015;33, Issue 1, Pages 35–36].


Adult Langerhans Cell Histiocytosis. For a picture, see JAAD February 2007 Volume 56, Issue 2, Pages 302–316


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