Every summer chest rash consider polymorphic sun rash, summer dermatitis, prickly heat, etc., can be treated with topical or oral medication, and to strengthen the care. 1. polymorphic sun rash: this is a recurring photosensitive skin disease, usually aggravated in spring and summer. You can apply dexamethasone cream, tacrolimus ointment, pimecrolimus cream, etc. locally. If necessary, hydroxychloroquine and niacinamide can be taken orally, and oral prednisone is needed in severe cases. 2. Summer dermatitis: persistent high temperature and sultry heat, coupled with sweating will easily trigger seasonal inflammatory skin diseases, this situation requires the use of glycerite cleaning or the use of weak glucocorticoid ointment coating, such as dinexed ointment, etc., usually pay attention to keep the skin clean and dry, wear wide and breathable clothes, reduce friction and sweating. 3. prickly heat: for people who sweat a lot, a lot of sweat is not easy to evaporate, it will lead to the stratum corneum impregnation and swelling, sweat duct rupture, causing inflammatory reaction, you can use prickly heat powder or glycerite lotion externally, to keep refreshing and clean, itching is serious, you can orally take cetirizine, cloratadine, and other drugs to treat it. Summer rash on the chest, should be timely consultation, under the guidance of the doctor with medication, prohibit private use of drugs.