Non-epidermolytic palmoplantar keratoderma

A rare, isolated, diffuse palmoplantar keratoderma disorder characterized by diffuse, homogeneous, mild to thick, yellowish palmoplantar hyperkeratosis (sometimes spreading over the dorsal aspect of fingers), which presents a white spongy appearance following exposure to water, frequently associated with dermatophyte infections. Hyperhydrosis is usually present and skin biopsy shows non-epidermolytic changes.