Allergic purpura, an allergic capillary and small vessel vasculitis, is characterized by non-thrombocytopenic cutaneous purpura, which may be accompanied by arthralgia, abdominal pain, and renal lesions. Patients can take medication, other treatments, and patients have a better prognosis after treatment. Patients with allergic purpura are mainly patients with the disease caused by metaplastic inflammation of small blood vessels throughout the body, patients will have skin symptoms, such as petechiae, ecchymosis and other symptoms, patients will also have joint symptoms, such as swelling of the knee joints, plasma effusion in the joint cavity and other symptoms, and there are also patients who will have gastrointestinal symptoms, such as abdominal pain, nausea, vomiting and other gastrointestinal symptoms. In addition, there are patients who may experience symptoms of kidney damage, such as hematuria and proteinuria. Patients with Henoch-Schönlein purpura should take timely treatment and actively search for the causative factors, such as preventing and treating upper respiratory tract infections, getting rid of infected foci (e.g. tonsillitis, dental caries, etc.), and avoiding suspected drugs, etc. Most of them are self-limiting and can be treated with adequate medication. Most of them are self-limiting, and can be treated with adequate fluids to facilitate the excretion of allergens, rest and topical glucocorticoids. Non-steroidal anti-inflammatory drugs such as ibuprofen and aspirin can be given when arthralgia is obvious. Abdominal purpura requires aggressive treatment with systemic glucocorticoids or even combined cytotoxic drugs (cyclophosphamide). Severe renal purpura such as impaired renal function and massive proteinuria also require systemic glucocorticoid therapy. The prognosis of patients after timely and regular treatment is good. Patients with purpura should go to the hospital in a timely manner, and medications should be used according to the doctor’s instructions.