Uh? Surely the only part of the collar you're likely to cut your hands on is at the clamp/bolt?I find lock on grips to be pretty dangerous, I've sliced my hands open on the collars a few times.
I always make sure to rotate my grips so the outer collar's split/clamp/bolt are positioned underneath the bar so other than roatating your hand to table (where I have a light grip anyway) that part never touches my hands..
if your clamps are ragged from crash damage, file/change them.