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Porokeratosis ptychotropica responding to photodynamic therapy: An alternative treatment for a refractory disease

Porokeratosis ptychotropica (PP) is a rare variant of porokeratosis with a special predisposition to affect body folds, particularly the intergluteal cleft. This disease is resistant to most topical and systemic treatments, as shown in the review of the literature we provide here. Itching and discomfort are often a difficult problem to solve.