The sun a sunny neck behind the ringworm may be solar dermatitis, psoriasis, lupus erythematosus and other diseases caused by patients need to choose drugs, physical and other methods of treatment. 1. solar dermatitis: if long-term exposure to strong sunlight, will lead to acute phototoxic reaction of the skin, caused by the sun on the back of the neck on the ringworm, you can local cold wet compresses, and then coated with glycerite lotion, zinc oxide ointment and other medications, to relieve the symptoms of skin discomfort. 2. Psoriasis: If the patient himself suffers from psoriasis, it can also be aggravated by prolonged exposure to the sun. You can apply hydrocortisone butyrate cream, mometasone furoate cream and other drugs, you can also choose narrow-spectrum medium-wave ultraviolet irradiation, can play an anti-inflammatory effect. 3. Lupus erythematosus: If you are suffering from lupus erythematosus, sun exposure will aggravate the symptoms. At this time, you can take prednisone acetate tablets, methylprednisolone tablets and other drugs, can play an anti-inflammatory and inhibit the role of immunity. The sun on the back of the neck on the ringworm can also be seen in lichen planus, pityriasis rosea, etc., the patient should not use drugs privately, you can choose to go to the hospital, under the guidance of the doctor symptomatic treatment. The above drugs need to be used in accordance with medical advice.