Generally, children’s allergic purpura is considered to be cured if it does not recur in 1~3 months, and the duration of the disease in a few patients can reach several months or more than 1 year. After timely, regular and systematic treatment, children with purpura can achieve the disappearance of clinical symptoms, normal laboratory tests and no recurrence after exposure to allergens or upper respiratory tract infections in 1-3 months, which is regarded as cured, and the duration of the disease in a few patients can be several months or more than one year. Anaphylactic purpura is a systemic vasculitis with small vessel vasculitis as the main lesion, commonly found in children aged 2-8 years old, more boys than girls, with the majority of cases occurring in spring and fall. Clinical manifestations are thrombocytopenic skin purpura, abdominal pain, blood in stool, joint swelling and pain, hematuria, proteinuria. Therefore, children with these symptoms should go to the hospital immediately for active treatment.