Hyperkeratotic porokeratosis ptychotropica with satellite lesions: a rare presentation of an unusual variant of porokeratosis.

Since its description in 1995, porokeratosis ptychotropica (PP) has remained a less-recognized variant of porokeratosis (PK). The term porokeratosis ptychotropica was coined in reference to its characteristic of affecting body folds. It mimics many other dermatological diseases and is therefore often misdiagnosed. We report a patient with multiple hyperkeratotic, warty lesions across the buttocks that mimicked cutaneous tuberculosis (CTB), but histological examination confirmed the correct diagnosis of PP.