There are more causes of red circles on the body, commonly urticaria, ringworm, annular granuloma, etc., which can be treated with external and internal medications. 1. Urticaria: limited edematous erythema caused by dilation and increased permeability of small blood vessels in the skin and mucous membranes, usually disappears after 2-24 hours, but it is very easy to repeat. Treatment is mainly anti-allergic treatment with antihistamine drugs, such as oral cetirizine, loratadine and other drugs. If the itching is severe, you can use topical glycerite and glucocorticoid drugs to stop the itching. The most important thing is to clarify the causative factors and avoid. 2. Tinea corporis: a superficial skin fungal infection caused by pathogenic bacteria adhering to the smooth skin of human beings. Clinically, it will also be manifested as red rings on the body, and the treatment mainly adopts antifungal therapy, with topical drugs such as econazole and ketoconazole cream, and oral drugs such as terbinafine and itraconazole. 3. Annular granuloma: it is a chronic inflammatory disease that occurs in the dermis or subcutaneous tissues, dominated by annular nodules or papules. There will also be red rings on the body. At this time, topical hormonal ointment such as mometasone furoate or local intradermal injection of tretinoin and other drugs can be used. There may be other reasons for the red ring, it is recommended to go to the hospital in time, the drug should be used according to the doctor’s instructions.