Redness of the skin after sun exposure is considered to be related to sunburn, also called solar dermatitis. It is recommended to detach from the environment, give topical medication, if necessary with oral medication, can relieve the symptoms. 1. Get out of the environment: the occurrence of this disease is related to sun exposure, because of receiving too much ultraviolet radiation, causing acute inflammatory reaction of the skin. It is recommended to get out of the environment in time to avoid further aggravation of sunburn. At the same time, cold wet compresses can also relieve the symptoms. 2. Topical medications: under the guidance of a doctor to give glycerine lotion, boric acid solution, pimecrolimus, tacrolimus ointment, with protection, anti-inflammatory, analgesic effect. 3. Oral medication: can also be used with oral medication, such as vitamin C, calcium gluconate, loratadine, cetirizine, etc., has the effect of anti-allergy, anti-itching, but also can promote wound healing. Localized redness, swelling, itching and pain after sun exposure of the skin, it is recommended to go to the dermatology department of the hospital in time. Drugs need to be used in accordance with medical advice.