A common genetically determined, chronic, inflammatory skin disease characterized by rounded erythematous, dry, scaling patches. The lesions have a predilection for nails, scalp, genitalia, extensor surfaces, and the lumbosacral region. Accelerated epidermopoiesis is considered to be the fundamental pathologic feature in psoriasis.

Synonyms: Palmoplantaris Pustulosis, Pustulosis Palmaris et Plantaris, Pustular Psoriasis of Palms and Soles, Psoriasis, Psoriases, Pustulosis of Palms and Soles