Pus in the ear is generally considered to be due to bacterial infection caused by otitis externa or purulent otitis media, which can be treated with causative and symptomatic treatment. 1. Otitis externa: Since patients with pus flow show symptoms of redness, swelling, heat and pain, and physical examination reveals more exudate, it is considered that the skin of the external ear canal may be damaged due to factors such as ear trauma or frequent pulling out of the ear, and secondary bacterial infections trigger otitis externa. First of all, it is recommended to use hydrogen peroxide, povidone-iodine and other disinfectants to clean up and disinfect the wound, you can put anti-inflammatory ear drops for local treatment, and if necessary, you need to use sensitive antibiotics and other anti-infective treatments according to the doctor’s instructions. 2. Suppurative otitis media: when there is pus, if the patient’s ear canal is blocked and swollen, pain symptoms are more obvious, accompanied by tinnitus, hearing loss, fever and other symptoms, consider that it is caused by suppurative otitis media. Whether in the acute phase or in a chronic purulent acute episode with significant active pus flow, consider dilution with 3% hydrogen peroxide to flush the pus from the external ear canal and middle ear cavity. Repeated flushing is followed by consideration of topical anti-inflammatory treatment with ofloxacin ear drops, and oral antibiotic therapy. It is recommended that the diagnosis be clarified and the extent of the lesion be assessed after examination, and that the specific medication, treatment and whether surgical debridement should be performed be selected according to the principles of treatment.