Otitis externa can be disinfected with iodophor. Povidone-iodine is a compound formed by iodine and polyvinylpyrrolidone, which is a commonly used clinical disinfectant. Povidone-iodine disinfection can kill some of the pathogenic microorganisms (e.g., bacteria, viruses, etc.); if you have otitis externa, you can use povidone-iodine to disinfect and treat it. Otitis externa using povidone-iodine method: use a cotton swab or cotton ball dipped in the appropriate amount of povidone-iodine to gently wipe the external auditory canal, to be povidone-iodine and the external auditory canal skin fully in contact with the external auditory canal, the use of clean cotton swabs or cotton swabs to dry the external auditory canal povidone-iodine liquid; can also be used to dilute povidone-iodine to rinse the external auditory canal, rinsing with clean cotton swabs or swabs to wipe dry the ear canal. Patients with otitis externa can use povidone-iodine to disinfect the ear canal, but it is recommended to be operated by a professional otorhinolaryngologist, especially pay attention to the concentration of povidone-iodine, as high concentration of povidone-iodine can cause burning and ulceration of the skin.