Diseases caused by allergy include urticaria, contact dermatitis, eczema, etc. The clinical manifestations are different depending on the disease, and the treatment usually includes general treatment, medication and other methods. 1. Urticaria: It is often manifested as local or generalized chilblains or angioedema, accompanied by intense itching. At this time, we need to identify the causative factors and avoid re-exposure, followed by glycerite lotion, zinc oxide ointment and other drugs to stop itching. 2. Contact dermatitis: often manifested as edematous erythema at the contact site, papules, papules, blisters, etc., accompanied by itching, tingling and other symptoms. At this time you need to find the causative factors and avoid, and then give medication, such as external boric acid solution wet compresses, glucocorticoid ointment such as mometasone furoate, hydrocortisone butyrate and other coated. And then combined oral antihistamines such as cetirizine, or vitamin C, calcium gluconate and so on. 3. Eczema: often manifested as erythema, papules, blisters, vesicles, oozing, mossy, etc., accompanied by different degrees of itching. At this time, according to the lesions of the choice of drug therapy, oozing more people can first use boric acid solution wet compresses, to be reduced, and then external glucocorticosteroid cream such as halometasone, dexamethasone cream and other drugs. If there is a secondary bacterial infection, antibiotic ointment such as mupirocin ointment can be used in combination. If you have allergic rashes, you can go to the dermatology department of a regular hospital in time. The medication should be used according to the doctor’s prescription.