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Repeated exposure to cold wind and water may cause an abnormal growth of bone within the ear canal.
The medical term for this bone growth is Exostosis, but it is more commonly referred to as surfer’s ear. This term is due to the fact that the most common cause of Exostosis is frequent exposure to cold wind and water, making this a condition that often affects surfers - mostly those who surf in cold water. But it is not only surfers who may suffer from this condition. Also people who enjoy skiing, kayaking, fishing, sailing, diving or any other sport, where the ears are exposed to cold wind and water can get Exostosis.
Ongoing exposure to cold wind and water causes the bone surrounding the ear canal to grow to protect the ear drum against the harsh elements. Exostosis is not necessarily harmful by itself, but constriction of the ear canal makes it difficult to drain water and ear wax and other debris can get trapped within the ear canal, which may lead to painful and repeated ear infections. These ongoing infections can result in permanent hearing loss.
If not treated, the bone growth can evolve to a complete blockage of the ear canal.
The moral of the story... protect your hearing!
Source - hearit.org
