Allergic dermatitis is also known as allergic skin disease, and the methods of treatment include removing allergens, general treatment, oral medication, topical medication and so on. 1. Remove allergens: it is necessary to clarify what is allergic to, it is best to go to the hospital to do allergen testing, life should try to avoid contact with animal hair, willow, pollen and other allergenic substances. 2. General treatment: It should be noted that avoid excessive scratching of the affected area, and should not use hot water to wash the skin, so as not to aggravate the symptoms of allergy. 3. Oral medicine: you can take chlorpheniramine maleate, phenylephrine, loratadine, levocetirizine hydrochloride and other antihistamine drugs. 4. Topical drugs: can be applied compound dexamethasone acetate cream, tacrolimus cream, glycerite lotion and other drug treatment. Patients with allergic skin diseases should consult the doctor in time, strictly follow the doctor’s instructions for treatment, and not use medication arbitrarily.