title: An unusual case of porokeratosis involving the natal cleft: porokeratosis ptychotropica?
authors.forename: G P
authors.initials: GP
authors.lastname: Lucker
authors.forename: R
authors.initials: R
authors.lastname: Happle
authors.forename: P M
authors.initials: PM
authors.lastname: Steijlen
mesh_terms: D000328:Adult; D002081:Buttocks; D006801:Humans; D008297:Male; D017499:Porokeratosis / Q000473:pathology*