Redness and swelling of the face with marked itching is most often seen in atopic dermatitis. It is suggested that increasing water intake, avoiding allergens, and giving medication when necessary can help relieve symptoms. 1. Drink more water: face allergy may be contact dermatitis, for example, contact with cosmetics, airborne dust, animal dander may cause an allergic reaction, resulting in redness, swelling and itching of the skin. It is recommended to increase the amount of water consumption, which is conducive to the elimination of toxins and can help relieve symptoms. 2. Stay away from allergens: for example, if you are allergic to pollen, it is recommended to reduce going out; if you are allergic to cosmetics, you can stop using suspicious cosmetics; if you are allergic to seafood, it is recommended to avoid the intake of such food to avoid further aggravation of allergic symptoms. 3. Medication: If facial allergy causes redness, swelling and itching, anti-allergy drugs, such as loratadine, levocetirizine hydrochloride, olopatadine hydrochloride, etc., should be given if necessary to reduce the release of histamine in the skin and alleviate the symptoms of redness and swelling, itching and etc. The above drugs should be used under doctor’s supervision. The above medications should be used under medical supervision. It is recommended to go to the dermatology department of the hospital and standardize the medication with the doctor’s advice.