Ringworm, also known as tinea versicolor, tinea cruris, tinea annulata, tinea ruffa and tinea pennata. It is a kind of dermatitis with coin-like appearance, visible blisters, crusts and scales, sometimes accompanied by itching. 1. Ringworm is usually secondary to other ringworm in the body, such as tinea cruris, tinea pedis, tinea cruris or tinea capitis, and then infects other parts of the skin from these ringworms. 2. Ringworm is mainly caused by infections of Trichophyton rubrum, Trichophyton rubrum and S. epidermidis, and is more likely to flare up especially in warm and hot humid environments. In addition, if the individual immunity is low such as obesity and sweating, suffering from the diabetes and often use immunosuppressant or corticosteroid, etc., can contribute to the occurrence of the disease. 3. Ringworm infection pathway is divided into direct or indirect contact infection, had contact with ringworm patients used towels, bathtubs, foot basin and slippers and other personal belongings, or contact with ringworm disease of animals, can also trigger ringworm infection. Therefore, emphasizing personal hygiene and cleanliness is extremely crucial to the prevention of the disease. If ringworm occurs, or if the symptoms persist and do not improve, patients should go to the hospital in time for treatment.