It is mainly the appearance of petechiae, petechiae, purple spots, pressure does not fade and symmetrical distribution, no blood blisters and ulcers such as allergic vasculitis performance. In the clinic is mainly due to drug stimulation or due to bacterial, viral, fungal infection, or allergic factors caused by purpura, clinical life need to avoid standing for too long, also need to avoid eating spicy, stimulating diet, and oral rutin tablets, vitamin C pills and calcium carbonate D3 tablets to reduce capillary permeability, so that the condition quickly improve or cure.