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Purpura (/ ˈ p ɜːr p jʊər ə / [1]) is a condition of red or purple discolored spots on the skin that do not blanch on applying pressure. The spots are caused by bleeding underneath the skin secondary to platelet disorders, vascular disorders, coagulation disorders, or other causes. [2]
Diascopy is a test for blanchability performed by applying pressure with a ... (petechia or purpura). Hemorrhagic lesions and nonvascular lesions do not blanch ...
The blanching skin test is used to determine if a rash or discoloration disappears when pressure is applied, which may be a sign of another illness.
Hematomas can be subdivided by size. By definition, ecchymoses are 1 centimetres in size or larger, and are therefore larger than petechiae (less than 3 millimetres in diameter) [12] or purpura (3 to 10 millimetres in diameter). [13] Ecchymoses also have a more diffuse border than other purpura. [14]
A non-blanching rash (NBR) is a skin rash that does not fade when pressed with, and viewed through, a glass. It is a characteristic of both purpuric and petechial rashes. [ 1 ] Individual purpura measure 3–10 mm (0.3–1 cm, 3 ⁄ 32 - 3 ⁄ 8 in), whereas petechiae measure less than 3 mm. [ 2 ]
Erythema disappears on finger pressure , whereas purpura or bleeding in the skin and pigmentation do not. There is no temperature elevation, unless it is associated with the dilation of arteries in the deeper layer of the skin. [citation needed]
Blanching of the fingers is also one of the most clinically evident signs of Raynaud's phenomenon. [1] Blanching is prevented in gangrene as the red blood corpuscles are extravasated and impart red color to the gangrenous part.
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