Swelling of the ear may be caused by trauma, insect bite dermatitis, acute diffuse otitis externa and other diseases, which need to be controlled by general measures, medication and physical therapy according to the cause and condition. 1. Trauma: If the swelling of the ear is caused by trauma, the epidermis can be intact within 24 hours after the injury, you can use a towel wrapped in ice packs for ice, which can cause vasoconstriction and reduce swelling. After 24 hours after the injury can be changed to hot compresses to improve local blood circulation. 2. Insect bite dermatitis: can be caused by insect bites or poisonous juice stimulation. If the symptoms are mild, local topical glucocorticosteroid cream, such as dexamethasone ointment; internal antihistamine drugs, such as loratadine; lesions, allergic reactions to the heavy short-term oral glucocorticosteroid, such as prednisone. 3. Acute diffuse otitis externa: caused by bacterial or viral infection. Prohibit excessive mechanical friction in the local area to avoid damage to the skin of the external auditory canal. When the external auditory canal is red and swollen, a tampon soaked with 10% ichthyol glycerin can be applied locally. If the external auditory canal is swollen and oozing, a tampon soaked with 5% to 8% aluminum acetate can be applied to the external auditory canal. It is recommended that patients with swollen ears go to the hospital for consultation, and follow the doctor’s instructions to standardize the use of medication and treatment after a clear diagnosis.