Red dots on the arm do not hurt or itch commonly seen in cherry angioma, allergic purpura, etc., need to be treated for the cause of the disease, commonly used treatments include drug therapy, physical therapy, surgical treatment, and so on. Cherry hemangioma:also known as geriatric hemangioma, the treatment of this disease is mainly laser, freezing or electrocautery, if necessary, surgical resection. Drug treatment for this disease is ineffective, and electrocautery can burn the rash, causing tissue destruction and detachment. Laser therapy can remove hemangiomas and is a common form of treatment today. If the localized rash is large, surgical excision is an option. 2. Anaphylactic purpura:This disease is mainly treated with medication, and if complications occur, surgical treatment is required. Muscle pain, oral antipyretic and analgesic treatment, such as acetaminophen, ibuprofen, etc.; oral glucocorticoids, such as prednisone, etc., to inhibit the inflammatory response; immunosuppressant treatment, such as cyclophosphamide, cyclosporine, etc.; the occurrence of intestinal collapse, intestinal perforation and other complications, the need for surgical treatment. It is recommended that patients go to the regular hospital dermatology consultation in a timely manner, follow the doctor’s instructions to clarify the diagnosis, reasonable treatment, medication, strictly comply with the doctor’s instructions to use drugs, not blindly self-medication.