First of all, you should abstain from eating various allergenic foods. Food allergy is a major cause of this disease, many foods in the foreign body protein can cause allergic purpura, these foods are mainly fish, shrimp, crab, eggs, milk, fava beans, pineapple, etc.. Once a patient is found to be allergic to a certain food, the food should be banned for life, and the cooking utensils and tableware that have been in contact with this food should not be used. In addition, patients with allergic purpura are advised not to eat vegetables like fresh flower buds that they have never eaten before, as plant pollen has been reported to be a common allergen as well. Song Qunxian, Department of Dermatology, The First Affiliated Hospital of Henan College of Traditional Chinese Medicine