He should be fine as long as you don't see blood. If you do, simply treat it as you would any small wound.

I know it can be a little scary. None of my balls do it, but my albino burm, she eats piglets and when she needs leverage to get them down, she will actually bite herself and push against her body to get the piglets down. Odd I know. If I knew how to post pics I would show you!