Red and itchy face is considered an allergic situation, including the following reasons: first, allergic reactions caused by contact with allergens such as dust mites, mites, dust, pollen, tree hairs, willow wool, etc. in the air, resulting in allergic reactions; second, allergic reactions caused by the consumption of large amounts of foreign proteins, such as beef, mutton, chicken, duck, goose, dog meat, shrimp, crab, scallops and other seafood; third, allergic reactions caused by The occurrence of allergic situations caused by contact with cosmetics, tar, gasoline, kerosene and other chemical products. In all of the above cases, oral levocetirizine hydrochloride oral solution can be taken for anti-allergy treatment.