Allergic purpura is prevalent in adolescents and belongs to a group of vasculopathic hemorrhagic diseases, with skin rash, arthralgia, abdominal pain, gastrointestinal bleeding and nephritis as the main clinical manifestations. Infection is the most common cause, with upper respiratory tract infections being the most common. A few children are also associated with food allergies, insect bites, medications or vaccinations. Main manifestations: Skin rash – mostly on both lower limbs, characterized by bright red or dark red macules, slightly protruding from the skin, and in severe cases, blood blisters, necrosis, and ulcers may appear. Gastrointestinal symptoms – most often manifested as paroxysmal periumbilical colic, which may be accompanied by vomiting. Some children have bloody stools or even vomit blood. In a few children, intussusception, intestinal obstruction, intestinal perforation, and hemorrhagic enterocolitis may occur, requiring surgical intervention. Nephritis manifestations – about 30-50% of children develop kidney damage, most often manifested as microscopic hematuria and proteinuria, severe children can also see the naked eye hematuria. In severe cases, renal failure and hypertension may occur. Joint symptoms – most often seen in the elbow, knee, ankle and other joints red and swollen, limited movement. Chinese medicine treatment: Most of the children can be completely relieved after symptomatic and comprehensive treatment. Generally, Chinese medicine is mainly used to clear heat and remove toxins, cool the blood and eliminate spots, but those with serious gastrointestinal lesions or kidney damage can be treated with hormones. Proprietary Chinese medicines: Qing Zi Combination (Beijing Children’s Hospital homemade), clearing heat and detoxification oral solution, nephritis rehabilitation tablets, Bailing capsule, locust yellow granules Life care: 1, to prevent respiratory infections and gastrointestinal infections, etc., pay attention to the change of weather to increase or decrease the clothes, and avoid the use of unclean food. 2, pay attention to rest, avoid strenuous exercise. 3, allergic purpura acute period as far as possible to avoid animal protein intake, such as meat, eggs, milk, etc.; to be improved and then increase the intake of animal protein one by one. Stimulating foods such as ginger, onion, garlic and leeks should also be avoided. Eat green vegetables and fruits rich in vitamin C, such as: kiwifruit, jujube, spinach, cabbage, tomato, orange, grapefruit, lemon, hawthorn, etc. can improve capillary permeability, conducive to the improvement of the condition. 4, when the appearance of digestive symptoms, timely medical care. 5.Allergic purpura nephritis has a more prolonged course, and the effect of Chinese and Western medicine comprehensive treatment is better.