Hog Island Abcess

So, this will be the THIRD time this has happened, this time it was much shorter of a time frame and it has moved to the side of her nose slightly. I paid over $400 for the vet to have fixed the issue several months ago and it has come back. Should I try and get the vet to take care of it free of charge, or what. I am conflicted on how to handle this right now.....

After several months ? No.

I would try and identify any underlying causes though - does he rub while trying to escape/ explore?

Is substrate getting caught inside his mouth?

Are there any longstanding dental problems?

Last time she had to go in, they checked out her mouth and it was ok, and it ended up being bacteria under the skin. He does not rub, hes always in his hide when I open the tub. No substrate caught as I had him on newspaper before and now paper towels.