There are many reasons for “red nevus” on the body, commonly cherry angioma, spider nevus and purpura, with different causes and different treatment methods. 1. Cherry-like hemangioma: formed by capillary expansion and proliferation of the skin, commonly found in middle-aged and old-aged patients, can be generalized all over the body, generally no need to deal with. If it affects the aesthetics, it can be removed by carbon dioxide laser, electrocautery or cryotherapy and other physical treatments. 2. Spider nevus: usually seen in patients with cirrhosis and liver insufficiency, due to the decreased ability of the liver to inactivate estrogen, resulting in increased levels of estrogen, causing capillary dilatation. If you want to get rid of the rash fundamentally, you should actively treat the primary disease; if the patient feels that it is an aesthetic obstacle and asks for treatment, you can also use laser or electrocautery to remove it. 3. Purpura: subcutaneous bleeding caused by infection, allergy, platelet reduction and other reasons. If it is allergic purpura, the triggering factors should be removed, and glucocorticoids should be given systematically in serious cases; if it is caused by lowered platelets, the primary blood disease should be treated, and platelets should be replenished if necessary. The appearance of red nevus should be promptly consulted to clarify the type of disease, and follow the doctor’s instructions for relevant treatment.