The first thing is to find out the cause of the disease, as the name implies allergic purpura is a disease caused by allergies, what things are allergic to? There is no definitive answer, the more consistent opinion is that it is closely related to infection, if the infection is not cleared, recurrence can be said to be inevitable. The first thing we need to do is to check what latent infections exist in the body. 1, a variety of viruses, including EBV, cytomegalovirus, hepatitis virus, herpes virus, etc. 2, a variety of bacteria, including common bacteria, drug-resistant bacteria, tuberculosis bacteria. 3, Mycoplasma, especially Mycoplasma pneumoniae. Second, proper treatment In addition to anti-allergic drugs, the use of expansion of microcirculation to promote the kidneys to discharge the antigen antibody complexes produced by the infection as soon as possible is the key to treatment, and also has a protective effect on the kidneys, which can significantly reduce the chance of kidney damage. The common type of allergic purpura does not need to use hormone treatment, hormone not only has obvious side effects, but also will mask the symptoms and aggravate the infection, thus increasing the number of relapses. Only arthritic, abdominal and some renal type patients need hormone treatment. Since it takes a long time for the antigen-antibody complexes causing allergy to be completely excreted from the body, the medication should not be stopped prematurely, and medication usually takes 2-3 months.