<unk>  (often abbreviated as "PC") is a rare group of autosomal dominant skin disorders that are caused by a mutation in one of five different keratin genes.<unk>  is often associated with thickened toenails, plantar keratoderma, and plantar pain.
Pachyonychia congenita
Platonychia
Lipoatrophia annularis
Linitis plastica
Hapalonychia
Steatopygia
Koilonychia
Trachonychia