Red spots and red dots on legs may be caused by ringworm, contact dermatitis, etc. It needs to be treated according to the cause of the disease, and is usually treated with medication. 1. ringworm: if the patient himself suffers from ringworm, onychomycosis, when touching the legs with the hands, it is easy to trigger ringworm, or legs in contact with the items used by ringworm patients, may also induce ringworm, manifested as the surface of the skin appears red papules, pimples, and then the formation of red patches covered with scales, accompanied by varying degrees of itching. Local topical antifungal ointment, such as ketoconazole cream, miconazole nitrate ointment, etc., the symptoms are serious, at the same time, oral antifungal drugs, such as itraconazole capsules. 2. Contact dermatitis: when the skin on the legs comes into contact with certain external substances, such as strong acid or alkaline detergents, pollen, shower gel, etc., contact dermatitis may be triggered, which is manifested as erythema, pimples, blisters on the surface of the skin, which may be accompanied by itching, burning, pain, etc. When there is no exudate, localized dermatitis can be used to treat the skin. When there is no exudate on the skin, topical glycerine lotion can be used, and when there is a small amount of exudate, topical glucocorticoid creams, such as dinexed cream and hydrocortisone butyrate cream, can be used. If the symptoms are serious, oral antihistamines, such as ibuprofen tablets and loratadine tablets can be used in combination with oral glucocorticoid medications, such as prednisone tablets. All of the above drugs have adverse reactions and are recommended to be used under medical supervision. Erythema and red spots on the legs may also have other causes, it is recommended to go to the hospital in a timely manner to improve the examination, to clarify the cause of the disease and then give targeted treatment.