Firstly, allergic purpura is caused by infections, drugs, or food allergies leading to skin ecchymosis and petechiae; in addition, it can also manifest as joint pain, hematuria, and melena. The presence of protein in a routine urine test along with hematuria or melena often indicates gastrointestinal allergic purpura and renal allergic purpura. The presence of proteinuria suggests kidney involvement, which is the most severe type among various forms of allergic purpura. If it is solely a cutaneous type, no special treatment is needed other than drinking more water and ensuring bed rest to alleviate skin ecchymosis. If proteinuria or hematuria occurs, one must rest in bed until the protein levels improve before resuming activities. Concurrently, corticosteroids and anti-allergy medications should be administered. (Medication should be used under the guidance of a professional doctor.)