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Extravasation of blood into the skin or mucous membranes. Area of flat color change may progress over time from blue-black to brown-yellow or green.
Petechiae, ecchymosis, and palpable purpura do not blanch because blood has leaked outside the vessels into the surrounding skin.
Ecchymosis in a patient with purpura fulminans
Ecchymoses in a patient with bacterial sepsis
Violaceous ecchymoses on the forearm in solar purpura
Extensive ecchymoses in a patient with steroid-induced purpura