PSORIASIS

(Lat.), n. f. Sor(psor)-i-a(a)'sis. Gen., -as'eos (--is'is). Gr., t/nopiWt? (from i/rupa, scabies). Fr.,p. Ger., trockene Fjechte, Schuppenftechte. 1. A non-contagious, chronic, relapsing disease of the skin, consisting e entially in an abnormal growth of the epidermis, attended with the production of silvery-white laminated scales resting upon a hyperaemic and easily bleeding corium, and occurring in circumscribed roundish, circiriate. gyrate, or irregular spots or patches which tend to spread at the periphery. 2. Of older and some recent writers, a chronic squamous form of eczema, attended with a thickened, often excoriated or fi ured conditi nof the skin. [G, 12, 62.] Cf. LEPRA (1st def.). Buccal p., Lingual p. See LEUCOPLAKIA buccal is. P. ahdominalis. See P. inveterata.P. acuta. P. in which red, slightly scaly, usually guttate efflorescences appear rather suddenly, scattered over the cutaneous surface. [G.] P. annular is. See P. circinata. P. asturiensis. See ROSE of the Asturias.P. buccal is. See LEUCOPLAKIA buccal is. P. centrifuga. P. the patches of which tend to heal in the centre while spreading at the periphery- [G.] P. circiiiata. P. with the efflorescences in the form of circles. [G.] P. compos it a. P. combined with some other cutaneous disease producing an eruption of mixed characters. [G.] See P. eczemateux and P. her pet i for me.P. diffusa. 1. P. in which the affected areas run into each other and form extensive patches or occupy a large portion of the general surface. [G.] 2. See ECZEMA squamosum. P. disco idea, P. disco ides. See P. nummular is.P. eczemateux (Fr.). A squamous disease usually affecting the Ifgs or arms, attended with itching and desquamation and sometimes with abundant secretion. [G, 50.] P. figurata, P. geographic a. P. with efflorescences arranged in gyrate or irregular figures. [G.] P. guttata. P. with small drop-like patches sprinkled over the A, ape; A", at; A3, ah; A4, all; Ch, chin; Ch2, loch (Scottish); [s. 350]