Porokeratosis ptychotropica: a diagnostic and therapeutic challenge

Abstract

The porokeratoses are characterized by the formation of cornoid lamellae. Porokeratosis ptychotropica (PP), is a rare form first described by Lucker, where the dyskeratotic skin changes are mainly located around the gluteal cleft or genital area (1, 2).

A 56-year-old man presented with mildly pruritic symmetrical hyperkeratotic brown plaques with subtle fine scaling, and smaller satellite plaques, affecting both buttocks, and partially the intergluteal cleft. (Figure 1 a) The plaque began a year before on the right buttock, and a second plaque followed on the left. Treatment with emollients, antifungals, and topical steroids was unsuccessful. He was otherwise healthy.

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