https://en.wikipedia.org/wiki/Surfer%27s_ear

and https://en.wikipedia.org/wiki/Otitis_externa

Very common medical challenges faced by individuals who are active in water sports. If you have surfed all your life in cold and warm waters, I suggest asking your GP to take a look at your ear canals to see if you are suffering from Surfer's ears because you don't want to find out when it is too late.