title: Porokeratosis plantaris discreta.
abstract: A 22-year-old black male patient developed discrete, exquisitely painful bilateral plantar lesions. Histologic examination revealed a cutaneous groove filled by a keratin plug (cornoid lamella). There is focal absence of granular layer underlying this defect. The differential diagnosis of this lesion, familiar to podiatrists but relatively unknown to dermatologists, is discussed.
mesh_terms: D000328:Adult; D001706:Biopsy; D002145:Callosities / Q000175:diagnosis; D003937:Diagnosis, Differential; D005533:Foot Dermatoses / Q000473:pathology*; D006801:Humans; D007642:Keratosis / Q000473:pathology*; D008297:Male; D012867:Skin / Q000473:pathology; D014860:Warts / Q000175:diagnosis