Perennial skin allergy on the face may be caused by contact dermatitis, eczema, hives and so on. Different causes, different treatment methods, you can treat the phenomenon of perennial allergy of the skin on the face through general treatment, drug treatment and other methods. 1. Contact dermatitis: localized allergic dermatitis is mainly due to contact with ultraviolet rays, poor quality cosmetics, physical and chemical substances and other stimuli. You can apply glycerite lotion or boric acid solution externally, and in severe cases, you can take chlorpheniramine maleate, cetirizine and other drugs orally. 2. Eczema: often appear face repeated allergic reaction, skin with pimples, oozing, broken, scaly skin thickening and other manifestations. Eczema can be prevented by checking the allergens, and can also be treated with topical dexamethasone cream, glycerite lotion, cetirizine and other drugs. 3. Urticaria: It is a kind of hives-like rash, which can be white, red or pink, protruding on the surface of the skin, accompanied by itching. The same can also be used externally with glycerite lotion to relieve itching, and can also take anti-allergy drugs, such as cetirizine and so on. The skin of the face is always allergic, need to go to the regular hospital for a detailed examination to determine the cause of the disease, and then carry out targeted treatment. The above drugs need to be used in accordance with medical advice.