Psoriasis

(so-ri’ ’-as-is) [ipupa, the itch]. A chronic inflammatory disease of the skin, characterized by the development of reddish patches covered with whitish scales. The disease affects especially the extensor surfaces of the body. P. annular is. Synonym of P. circinata. P., Buccal, P. buccal is. Synonym of Leukoplakia buccal is. P. circinata, P. in which the central part of the lesions has disappeared, leaving ring-shaped patches. P. diffusa, a form in which there is coalescence of large contiguous lesions. P. guttata. See P. punctata. P. gyrata, P. with a serpentine arrangement of the patches. P. punctata, a form in which the lesions consist of minute red papules which rapidly become surmounted by pearly scales. P. universal is, a form in which the lesions are all over the body. 531