It can happen with any type of grappling. There is protection...... I will get back to you when I remember the name of the thing....... they look like ear muffs made of hard plastic
Check out the Wiki page for it. Some good info there.
we just called them head gear.
to the op I didnt get it real bad my left ear lost some of its curl in the top but thats about it. I wore head gear allot but not all the time. I started to show signs after a year in a half. If you just protect your ears you shouldnt get it too bad.
"The fat man flies at midnight"