MONDO_0008291 (porokeratosis plantaris palmaris et disseminata) (PPPD) is a rare form of porokeratosis occurring mainly in adolescence and characterized by small pruritic or painful keratotic papules that first appear on the palms and soles, and may gradually become generalized. Also known as: palmar, plantar and disseminated porokeratosis, porokeratosis 2, palmar, plantar, and disseminated.