Purpura is a symptom of bleeding from the skin. Purpura may be due to a non-disease cause, or it may be due to a disease. In some cases, purpura can be life-threatening. 1. There are many causes of purpura, including non-disease causes, such as drug effects, insect bites, vaccinations, cold stimulation, etc.; and disease causes, such as hereditary hemorrhagic capillary dilatation, thrombocytopenic purpura, thrombocytopenic purpura, disseminated intravascular coagulation. 2. Most of the purpura belongs to chronic disease or non-disease state, but it should be taken seriously and actively seek medical treatment. 3. Some purpura may be progressively aggravated, accompanied by disturbance of consciousness, severe bleeding, etc., which should be actively sought for medical treatment and may be life-threatening. If purpura occurs, you should actively seek medical treatment to avoid delaying the condition.