Pics? I've never had this problem with any of my basses. I imagine it might happen if the string is slipping badly on the post. I don't see how it would occur from normal string changes and tuning. If they're black or gold tuners then maybe some of the finish may wear off around the post but it should not be "chewed up".
"You won't know your worth now, son, until you take a hit
And you won't find the beat until you lose yourself in it"