The redness and swelling of the ear may be caused by acute diffuse otitis externa, eczema of the external auditory canal, boils of the external auditory canal, etc. According to the different causes of the disease, we need to choose medication, general treatment and other methods. 1. Acute diffuse otitis externa: redness and swelling of the ear may be caused by acute diffuse otitis externa, you can use hydrogen peroxide to clean the external auditory canal, with oral amoxicillin capsules and other anti-inflammatory drugs, and topical use of ofloxacin ear drops and other medications to help reduce the swelling. 2. Eczema of the external auditory canal: the redness and swelling of the ear may be eczema of the external auditory canal, redness and swelling of the ear caused by contact with allergic substances, no oozing or oozing in the acute stage of the glucocorticoid cream, oozing more than 3% boric acid solution or 0.1% ethacridine solution can be used to disinfect the cold wet compresses, anti-inflammatory, astringent, oozing is reduced with the glucocorticoid cream, and alternating with the use of oils. 3. contact dermatitis: ear redness and swelling may be the cause of contact dermatitis, often caused by wearing metal jewelry in the ear, redness and swelling is obvious, external glycerine lotion, oozing more than 3% boric acid solution with cold wet compresses, oral chlorpheniramine maleate tablets, prednisone and other drugs in time to reduce swelling. After the red and swollen ears, you should go to the regular hospital in time, systematic examination and diagnosis, and follow the doctor’s instructions to standardize the use of drugs and treatment.