After the sun after the skin red, generally divided into physiological factors and pathological factors, need to clarify the specific causes and then targeted treatment. 1. Physiological factors: In general, the skin is exposed to the sun after the temperature rises, there will be capillary expansion, so that the skin transient redness. This situation does not require special treatment, transfer to the shade, the redness of the symptoms will be relieved. 2. Pathological factors: the redness of the skin after sun exposure may be a manifestation of some diseases, such as solar dermatitis, rosacea and so on. Solar dermatitis should be avoided in daily life, and if necessary, glucocorticoid drugs such as hydrocortisone cream can be used for anti-inflammatory treatment under the guidance of a doctor. Rosacea is a chronic inflammatory disease, daily life need to pay attention to the sun, when the disease flare-ups can use medical cold compresses for relief, but also follow the doctor’s instructions to use tacrolimus ointment and other drugs for treatment. If the redness of the skin after the sun is more serious and can not be relieved for a long time, it is recommended to go to the hospital in time to avoid delaying the treatment of the disease.