Redness of the skin from swimming sunburn is considered to be the occurrence of solar dermatitis, which can be treated topically, such as physical cooling or application of topical medications. Sunburn and redness of the skin is usually due to an acute phototoxic reaction of the skin exposed to the sun. It is also known as solar dermatitis. It can manifest as redness with burning and stinging. For these symptoms, first, topical treatments, such as physical cooling, are needed. For mild symptoms, glycerite lotion can be applied. For more severe symptoms of skin damage, topical 3% boric acid solution or glucocorticoid creams such as mometasone furoate cream need to be applied, along with a combination of oral antihistamines such as loratadine, or vitamin C and calcium gluconate. In order to avoid sunburned skin, it is important to pay attention to good sun protection, and pay attention to shade protection when going out. If the symptoms of sunburn are more serious, it is recommended to go to the hospital in time to receive standardized diagnosis and treatment, and medication should be used in accordance with medical advice.