Salt should not be washed on the face, because salt has a certain stimulating effect, and the skin of the face is more delicate and thin, salt washed may cause the corresponding allergic reaction. In the same principle, vinegar and alcohol should not be washed on the face, both may aggravate the condition. The most correct way is to use a mild, non-irritating cleanser to apply to the face, and then clean the face thoroughly with warm water. For allergic dermatitis, cosmetic dermatitis, hormone dependent dermatitis or solar dermatitis can only be washed with warm water, and it is not suitable to scrub or apply film with any cleanser or anything. For treatment, all of them can be treated with oral anti-allergy treatment with levocetirizine hydrochloride capsules 1 capsule/time, 1 time/day.