In the early stage of allergic purpura or obvious rash, because the body is in a highly sensitized state, the original non-sensitized items, at this time can also trigger a metabolic reaction, so you should give dietary control, reduce or limit the intake of allogeneic protein, as far as possible to avoid the metabolic reaction in the hypersensitive state. Daily dietary recommendations are as follows: 1. When the rash is severe, meat, eggs, milk, fish and shrimp, vegetables, fruits and condiments should be prohibited, and three meals should be based on noodles, rice and steamed buns. 2, the disease control, a small amount or no new rash, you can gradually increase a single food, 3-5 days without recurrence of the disease will add another. If the disease recurs after adding, stop eating and start again after the disease is stabilized. Usually start by adding vegetables. (1) The order of adding vegetables: bok choy, cauliflower, cucumber, zucchini, potatoes, tomatoes, and no irritating vegetables such as leek and parsley for the time being. (2) the order of adding fruits: apples, bananas, oranges, etc., starting with small amounts, can be added alternately with vegetables. (3) The order of adding protein foods: vegetable protein first, then animal protein. Soy milk, tofu, pork, milk, eggs, beef, fish, etc.