a rash of purple spots on the skin caused by internal bleeding from small blood vessels.
any of a number of diseases characterized by such a rash:
/ pərˈpyoŏrik/ adj.
purpura (per-pew-ră) n.
a skin rash resulting from bleeding into the skin from blood capillaries; the rash is made up of individual purple spots (see petechiae
). Purpura may be due either to defects in the blood capillaries (nonthrombocytopenic p.
) or to a deficiency of blood platelets (thrombocytopenic p.
). idiopathic thrombocytopenic p.
an autoimmune disease in which the platelets are destroyed, leading to spontaneous bruising. A mild acute form affects children; a more serious chronic form typically affects adults. See also thrombocytopenia
, Henoch-Schönlein purpura
Purplish patches on the skin due to seepage of blood from underlying vessels. Physical injury, vitamin deficiencies, some allergies and certain drugs are among the causes.