The severity of purpura needs to be considered according to a number of aspects, which can be the color, size, location and accompanying symptoms of purpura. 1. Purpura color: Purpura is formed under the skin or mucous membranes, red or dark red bruises. The brighter the color, the more serious the condition. 2. Purpura size: the diameter of purpura is usually 3~5mm, and the larger the diameter, the more serious the disease. 3. Purpura site: Purpura is commonly found in the waist and abdomen, legs, feet, etc. The more parts of the body, the higher the risk of purpura. 4. Accompanying symptoms of purpura: whether or not accompanied by nosebleeds, gum bleeding, hemoptysis, blood in stool, whether or not the skin is pale, fatigue, dizziness, tinnitus, jaundice, abdominal pain, bone and joint pain and other symptoms of anemia. If patients are diagnosed with purpura, they need to go to the hospital for professional examination and should follow the doctor’s instructions to standardize the treatment.