Allergic purpura is a kind of allergic vascular inflammatory lesion in which autoimmune function is disturbed under the state of infection and exertion, and tofu is rich in heterogeneous proteins, at this time the intake of heterogeneous proteins may appear systemic small vasculitis, aggravate kidney damage, and even cause purpura nephritis, so patients with allergic purpura are cautious to eat tofu. In addition to soy products, allergic purpura patients also need to pay attention to eat less spicy and stimulating food and seasonings, keep the diet light, eat more fresh fruits and vegetables rich in vitamin C, such as kiwi, tomatoes, cabbage, etc.. You can also eat more carbohydrates for energy, such as bread, milk, meat, etc. Patients with mild abdominal pain can eat a small amount of easily digestible food, those with severe abdominal pain should fast temporarily, and patients with purpura nephritis should have a low salt diet. The treatment of allergic purpura focuses on actively looking for the causative factors, and avoiding allergens is the key to treating the disease. During the onset of the disease, you should rest in bed and avoid premature or excessive walking activities. Avoid exertion and keep warm to avoid catching cold to trigger infection. After the attack of allergic purpura, you can take drugs to reduce the rash in time under the guidance of doctor. If there is more serious allergic purpura, such as purpura nephritis, you need to consider using glucocorticoid.