Skin redness due to allergy, if the skin lesions are large, with obvious swelling and itching, sodium thiosulfate can be given static, glycopyrrolate, vitamin C static or calcium gluconate slow static push. At the same time, you can take oral antihistamines, such as loratadine, cetirizine, ketotifen, cyproheptadine, etc. In severe cases, you can also give glucocorticosteroids orally or static, and locally give boric acid solution or saline wet compresses, which can effectively reduce swelling. If the lesion area is small, the symptoms are mild, give antihistamine drugs oral can be. You need to avoid hot and cold stimulation, do not drink alcohol, avoid eating spicy stimulating food, beef and mutton and fishy seafood, accompanied by infections need to actively treat infections, avoid contact with suspected allergens, avoid excessive cleaning.