purpura

(pur'pu-rah) [L. from G. porphyreos, purple.] An affection characterized by hemorrhage into the skin, the color being at first red, becoming gradually darker, then purple, fading to a brownish yellow, and finally, in the course of two or three weeks, disappearing; it may result in a permanent pigmentation; extravasations occur also into the mucous membranes and internal organs. Hen'- och's p., an infectious disease of childhood, similar to p. rheumatic a; see Henoch, malig'nant p., cerebrospinal fever, p. angioneurot'ica, a diseas'e marked by an gio neurotic edema, petechise, and hyperesthesia of the skin and gastric mucous membrane, the latter expre ed in the form of gastric crises, p. annul a'ris telangiecto'des, Majocchi's disease, an eruption of punctate or larger purpuric spots, often grouped in ring form, a ociated with more or le pronounced telangiectasia, p. bullo'sa, pemphigus hsemorrhagicus. p. ful'minans, a severe and rapidly fatal form of p. haemorrhagic a, occurring especially in children; Henoch's* p. p. hamorrhag'- ica, land scurvy, morbus maculosus WerlhofEi; a disease, probably infectious, characterized by extensive ecchymoses, hemorrhages from the mucous membranes,- and prostration of a typhoidal nature; it lasts from a few weeks to several months, and may terminate fatally, p. iod'ica, iodic p., an eruption of discrete miliary pete chias, usually confined to the lower extremities, appearing in rare instances during the administration of any of the iodides, p. nau'tic a, p. scorbutic a. p. nervo'sa, Henoch's* p. p. papillo'sa, lichen livid us. p. pu'Ucans, p. pulico'sa, petechise caused by the bites of insects and animal parasites, p. rheum at'ica, pehosis rheumatic a, Schonlein's disease p. a ociated with erythema multi for me, occurring; with acute rheumatic arthritis, p. scorbu'tic a, scorbutus, scurvy, p. sen i'lis, ses on the legs in aged and debilitated subjects. p. sim'plex, a hemorrhagic eruption in the form, of petechiae or larger ecchymoses, usually unaccompanied by constitutional symptoms. p. symptomatic a, a petechial eruption in scarlet fever and other exanthemata, p. urti'cans, p., simplex accompanied by an urticarial eruption.