Skin redness in the sun is mainly due to solar dermatitis, solar dermatitis can be recovered in about 2 to 7 days in general, mild general recovery in about 2 to 3 days, moderate and severe solar dermatitis general recovery in about 7 days, the specific recovery time varies from person to person. If the patient is only simple skin redness, there is no peeling, blistering, pain, etc., belongs to the mild solar dermatitis, mild general 2 to 3 days can gradually recover, do not need to take special treatment. If the patient’s skin redness is more serious, and accompanied by peeling, pain, blisters, etc., the skin recovery time may be slightly longer, about 7 days or so, some of the skin is more sensitive to the patient’s recovery time may be longer, the specific recovery time varies from person to person. It is recommended that patients go out to do a good job of sun protection, wear good sunscreen clothing, use sunscreen umbrellas or in the exposed parts of the skin to apply some sunscreen, and do not stay in the sun environment for a long time, so as to avoid sunburn. If necessary, it is recommended to go to the hospital, under the guidance of the doctor to treat the symptoms.