By Gary M. White, MD
Fistula, Sinus Tract
Psoriasis. Note the uniform redness in contrast to Tinea Corporis (below).
Tinea Corporis. Note the active border in comparison to Psoriasis (above).
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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