What is it?
Surfers ear is a condition which affects the ear canal. It is a bony growth that is formed when the ear canal is exposed to too much cold, especially cold water. It causes a loss of hearing, of course, but also water and debris can get trapped behind the growths and cause infections.
Prevention
Wearing a skull cap will keep some of the water out of your ears, and keeps your ears warm. If you expect your head to get wet a lot, then ear plugs would be more suitable.
Treatment
In early stages, antibiotics can stop the inflammation, but later, surgery is required to remove the growths.
Further information
Falmouth health centre article
Links