紫癜是血液系统疾病常见的主要症状之一,除血液病外,其他系统的许多疾病也可以出现紫癜,其发病因素较多,发病机理亦很复杂。紫癜以皮肤出现青紫斑点、斑块为主要临床表现。主要症状为:皮肤粘膜因出血而形成红色或暗红色的斑点,一般不高出皮面,压之不退色,其出现紫癜的广泛程度与出血面积视病情而异。一般将直径不超过2mm 的称为淤点,直径3—5mm 者称为紫癜,直径5mm 以上者称为淤斑,片状出血并伴有皮肤显著隆起者称为血肿。紫癜新发时,一般小的淤点多呈 Purpura is one of the most common symptoms of hematological diseases. Apart from blood diseases, purpura also occurs in many diseases of other systems. The pathogenesis of purpura is high, and the pathogenesis is also complicated. Purpura with purple spots appear on the skin, the plaque as the main clinical manifestations. The main symptoms are: skin and mucous membranes due to bleeding and the formation of red or dark red spots, generally not higher than the skin, the pressure does not fade, it appears the extensive extent of purpura and bleeding area varies depending on the condition. Generally not more than 2mm in diameter called the deposition point, 3-5mm in diameter are called Purpura, diameter of 5mm or more known as ecchymosis, flaky bleeding associated with significant uplift of the skin is called hematoma. Purpura new hair, the general appearance of small bruises