Fungal otitis externa is caused by fungal growth in the external ear canal due to prolonged moisture or prolonged use of oral antibiotics and immunosuppressants. The main manifestations are ear congestion, itching of the ear, and, in the case of co-infection, purulent secretions that cause pain in the ear. If not actively treated, it can invade the tympanic membrane and cause fungal tympanitis, resulting in tympanic membrane congestion and hearing loss, etc. It can also invade the external ear canal and cause damage to the skin of the external ear canal, or even erode the bone of the external ear canal and cause defects in the wall of the external ear canal. Therefore, fungal otitis externa needs to be treated actively. First, it is necessary to keep the external ear canal dry, and 6% sodium bicarbonate solution can be used to fill the external ear canal to inhibit the growth of fungi, and antifungal ointment can also be used to rub the external ear canal for the purpose of treating fungal otitis externa.