Some medicines can cause allergic purpura, and Chinese medicines are complex in composition, so some people will develop allergic purpura after taking Chinese medicines. Allergic purpura is prevalent in children and young people, mainly characterized by fever and sore throat before the onset of the disease. The rash is usually found on the extensor side of the limbs and buttocks, especially on the lower legs, and the rash is a small and scattered red or purplish red petechiae and ecchymosis, which can be palpated with the hand, symmetrically distributed, and can be fused into a large area, and is prone to recurrent episodes. Severe allergic purpura may cause damage to other parts of the body other than the rash. Arthritic purpura may cause knee and ankle pain; gastrointestinal purpura may cause pain around the umbilicus or in the lower abdomen, accompanied by nausea, vomiting and blood in the stool; renal purpura may cause hematuria and proteinuria, and the patient may often have low back pain. The symptoms mentioned above need to stop taking Chinese medicine, and use antihistamines, such as loratadine and ibastine, as appropriate, as well as drugs to reduce capillary permeability and brittleness, such as vitamin C, rutin tablets, and calcium, and in severe cases, glucocorticosteroid therapy can be used. During the attack of anaphylactic purpura, you need to pay attention to go to bed early, get up early and don’t stay up late, eat less spicy, greasy and beef, mutton, seafood, don’t drink alcohol, reduce the activity of the lower limbs, and can’t take the traditional Chinese medicines that lead to allergy after recovery.