The redness of the skin of the seaside sun is mostly caused by solar dermatitis, which can be improved by general treatment and topical medication. Solar dermatitis is due to the skin by strong sunlight caused by acute damage to the skin reaction, can appear skin erythema, mild symptoms can be applied locally glycerine lotion, or topical glucocorticoid drugs, such as hydrocortisone butyrate soft, nederol ointment and other medication; the condition of the more serious can be used to use a 3% borate solution wet compresses on the affected area. When accompanied by systemic symptoms, oral antihistamines such as loratadine and cetirizine can be taken. Severe cases can be short-term oral prednisone treatment in small doses. Drugs should be used under the guidance of a doctor. Outdoor attention should be paid to sun protection, to avoid recurrence of the disease.