The etiology of eczema of the external auditory canal eczema is still unclear, mostly thought to be related to allergic reactions may also be related to mental factors, neurological dysfunction, endocrine dysfunction, metabolic disorders, poor digestion and other factors. Factors that cause allergic reactions can be food (such as milk, fish and shrimp, seafood, etc.), inhalants? (such as pollen, animal fur, paints, chemical gases, etc.), contacts (such as drugs, cosmetics, fabrics, soaps, hearing aid chemicals, etc.) and other intrinsic factors. Humidity and high temperature are often causative factors. Eczema of the external auditory canal is classified as acute, subacute, or chronic. Acute eczema is characterized by itchy, burning sensation and yellow, watery secretions that coagulate and form a yellow crust after digging into the ear. Sometimes the discharge causes lesions wherever it flows. Subacute eczema is mostly caused by untreated, improperly treated or prolonged acute eczema. The area is still itchy and exudes less fluid than acute eczema, but has crusting and flaking. Chronic eczema becomes chronic when acute and subacute eczema recurs or is not treated for a long time, with severe itching in the external ear canal, thickened skin and flaking. The first step in treating this disease is to identify the cause and remove the allergen. If the cause is unknown, stop eating spicy, irritating or strongly allergenic foods. Do not scratch the external ear canal and do not wash it with water casually; if local medication is suspected to cause this, stop using these medications; if the irritation is caused by middle ear pus, apply effective medication to treat otitis media, while taking into account the treatment of otitis externa. Anti-allergic drugs such as Benadryl, loratadine, etc. should be applied systemically. Systemic or local antibiotics can be added if secondary infection occurs. For acute ooze, the treatment with topical medication is followed by washing the ooze and scab with glycolic acid lotion and wet dressing with boric acid solution or aluminum acetate solution. After drying, apply zinc oxide paste or boric acid zinc oxide paste. Physical therapy such as ultraviolet radiation is also available. For subacute exudate, apply 2% gentian violet solution locally, and after drying, apply zinc oxide paste or boric acid zinc oxide paste. For chronic dryness, apply zinc oxide paste or boric acid zinc oxide paste, 10% zinc oxide ointment, white mercury ointment, antibiotic hormone ointment or eloxon ointment, etc. If there are more dry scabs, use hydrogen peroxide to clean the area first and then use the above creams. For thickened skin, 3% salicylic acid ointment can be used.