When multiple exostoses prevent the examiner from seeing the tympanic membrane, audiometric tests and tympanometry may be useful in assessing middle ear function.
If the entry of cold water into the ear canal is prevented by wearing suitable earplugs, then the exostoses will not continue to enlarge.
Since most exostoses are asymptomatic, they usually require no treatment.
In cases where entrapment of wax occurs or chronic otitis externa develops, repeated debridement with the operating microscope may be required on a regular basis. In those rare instances when the exostoses totally occlude the external canal or prevent a permeatal approach to the middle ear, a transcanal surgical removal may then indicated.
Multiple exostoses are blocking the lumen of the bony external canal.