MONDO_0016471 (pachyonychia congenita) (PC) is a rare genodermatosis predominantly featuring painful palmoplantar keratoderma, thickened nails, cysts and whitish oral mucosa. Also known as: Jackson-Lawler type pachyonychia congenita, Jadassohn-Lewandowsky syndrome, PC, pachyonychia congenita, Jadassohn-Lewandowsky type.