The most common cause of purulent discharge from the external ear canal in children is acute suppurative otitis media. Because the eustachian tube in children is relatively short and flat, when an inflammatory infection is encountered, such as acute upper respiratory tract infection, acute rhinitis, or acute sinusitis, the inflammation will cause retrograde infection through the eustachian tube resulting in fluid accumulation in the middle ear cavity, and when the inflammation is severe it will cause perforation of the eardrum resulting in pus flowing from the external ear canal. In general, patients will have a sudden onset of high fever with a temperature of 38.5°C or higher. In the absence of tympanic membrane perforation, patients will experience ear pain, tinnitus, and hearing loss. Once the tympanic membrane is perforated, the ear pain gradually decreases, a large amount of pus and blood discharge is visible in the external ear canal, and the patient’s fever is relieved. In terms of treatment, because it is an acute inflammatory infection, the pathogenic bacteria are mostly Streptococcus haemolyticus, so the patient needs symptomatic anti-inflammatory treatment, and can input ceftriaxone sodium, cefazolin sodium, and cefotaxime sodium. It is also necessary to use middle ear irrigation twice a day for about a week to gradually heal.