there are variations on the surgery - one where they chip the exostoses directly through the ear canal, and one where they make an incision behind the ear - some trade-offs between invasiveness and risk of perforated ear drum, etc.. ask about both.
if you have access, check this out --
Wiley InterScience :: Session Cookies
shoot me a message if interested in full article. result of the Surfer's Ear Tour, that stopped through CKS paddle fest, teva games, fibark, etc. during 2008