Pus flowing inside the ear is usually seen in two diseases: first, an attack of acute otitis externa; second, an attack of acute suppurative otitis media. Suppurative otitis media is usually secondary to an acute upper respiratory tract infection, and when the inflammation is severe it leads to perforation of the eardrum, causing pus flow. Patients often have fever, headache, ear pain, hearing loss, tinnitus, pus flowing from the external ear canal and other related symptoms, which can be confirmed by examining an electronic otoscope. During the examination, a circular perforation is visible in the tense part of the tympanic membrane, and when the nose is pinched and puffed hard, pus can be seen to spill out from the perforation. In terms of treatment, symptomatic anti-inflammatory treatment is needed, which can be done by infusion and inputting ceftriaxone sodium and cefotaxime sodium, and it will heal in about a week or so. Acute otitis externa is caused by redness, swelling and pain of the skin of the external ear canal due to repeated ear pulling, swimming in water, and trauma, resulting in inflammatory exudation, and purulent secretions are seen to exude during the acute stage. Patients can use Eloson ointment or 999 dermaplanin for local wiping, or neomycin ointment for local wiping, while avoiding repeated ear-pulling and not eating spicy and stimulating foods, which can heal in about a week.