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Vascula purpura - Definition


Definition


A purpura is a lesion on the skin or mucous membrane. This type of lesion is characterized by associated haemorrhage and its purple colouring. It constitutes extravasation or abnormal move of red blood cells out of the blood vessels, thus accumulating in the dermus. This manifestation can be secondary to several different processes, notably a direct attack on the blood vessels, where it is called vascular purpura, or in cases of platelet deficiency, where it is called thrombocytopenic purpura. The various forms of vascular purpura include the more or less acute condition of vasculitis secondary to inflammation of the vessel walls following infection, cancer, or conditions affecting the interior of the blood vessels, notably including embolisms or coagulation deficiencies.
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