Focal palmoplantar keratoderma with oral mucosal hyperkeratosis (also known as "Focal epidermolytic palmoplantar keratoderma," "Hereditary painful callosities," "Hereditary painful callosity syndrome," "Keratosis follicularis," "Keratosis palmoplantaris nummularis", and "Nummular epidermolytic palmoplantar keratoderma") is an autosomal dominant keratoderma

Keratoderma

-Congenital:* Simple keratodermas** Diffuse palmoplantar keratodermas*** Diffuse epidermolytic palmoplantar keratoderma*** Diffuse nonepidermolytic palmoplantar keratoderma*** mal de Meleda** Focal palmoplantar keratoderma*** Striate palmoplantar keratoderma...

 that represents a clinical overlap syndrome with pachyonychia congenita type I

Pachyonychia congenita type I

Pachyonychia congenita type I is an autosomal dominant keratoderma that principally involves the plantar surfaces, but also with nails changes that may be evident at birth but more commonly develop within the first few months of life.- See also :* Palmoplantar keratoderma* List of cutaneous...

but without the classic nail involvement.