They are found mostly on skull and facial bones.
Osteomas are slow growing lesions that are normally completely asymptomatic.
They only present if their location within the head and neck region is causing problems with breathing, vision, or hearing. Multiple osteomas are associated with Gardner's syndrome. The etiology of osteomas is unclear. They may be related to osteoblastomas or may simply be a developmental anomaly. The fact they are often found in the auditory canals of swimmers and divers who frequent cold water suggests that they are some type of inflammatory reaction.