Definition of Purpura

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Purpura: 1. A hemorrhagic area in the skin. The area of bleeding within the skin, by definition, is greater than 3 millimeters in diameter. The appearance of the purpura depends on age of the lesion. Early purpura is red and becomes darker, then purple, and brown-yellow as it fades. Purpura does not blanch when touched.
2. A condition characterized by purpura such as immune thrombocytopenic purpura and Schonlein-Henoch purpura.