Fungal otitis externa does not usually cause tympanic membrane invagination. Tympanic membrane invagination refers to a state in which external gases cannot enter the middle ear due to prolonged poor ventilation and drainage of the middle ear, resulting in the formation of relative negative pressure in the middle ear cavity and causing the tympanic membrane to change its original normal structure and sink inward. Commonly found in tympanic membrane dysfunction, air pressure injury, inferior turbinate hypertrophy, secretory otitis media and so on. Fungal otitis externa is a conditionally pathogenic fungus that invades the external auditory canal and multiplies in a moist environment, resulting in an inflammatory lesion of the external auditory canal. As the fungus multiplies, it can build up into clumps or the tympanic membrane can be invaded, resulting in congestion and thickening of the tympanic membrane. Fungal otitis externa is recommended to go to the hospital in a timely manner, and complete the relevant treatment under the guidance of the doctor.