Re: Why is there a hole in my gums?! [w/ pictures]
I do believe that appears to be a fistula. You probably have an underlying infection in the wisdom tooth. The infection is finding a way to the surface to drain rather than blowing up and causing you pain. That doesn't mean it's gone, though.
You really need a dental evaluation on that area with xrays to see which tooth is affected. This won't go away on it's own and a simmering infection can dissolve the bone that holds the teeth in.
Please make that appt for an evaluation. You'll be glad you did.
Best to you,