The symptoms of purpura are petechiae and ecchymosis on the surface of the skin, not prominent on the surface of the skin, the rash does not fade when pressed, symmetrically distributed, and arthralgia, nephritis, gastrointestinal bleeding and other symptoms. Treatment can be oral levocetirizine hydrochloride capsules, combined with compound glycyrrhizin capsules, and can be combined with vitamin C capsules, rutin tablets, and calcium carbonate D3 tablets. If joint symptoms occur, oral Kunxian capsules or tretinoin tablets can be taken, but these two drugs have certain side effects, and regular monitoring of blood routine, liver function, kidney function, as well as gastroscopy, enteroscopy, electrocardiogram is needed. If gastrointestinal bleeding or nephritis occurs, glucocorticoids such as methylprednisolone injection need to be administered for immunomodulation.