I would get a second biopsy/opinion or at the very least, watch the area very closely. If the area on your tongue changes in any way - have it looked at again.
I had two biopsies that were negative. I also did not act immediately as I was swayed by false information that oral cancer doesn't usually hurt and my tongue was VERY painful! It can hurt a great deal if the cancer is on your oral tongue.
I still remember the first appointment with my ENT who said "Well, we could just zip it off, but it would have the same risk as a tonsillectomy - let's wait for the biopsy."

I sure wish now that I'd had it 'zipped off'

I really don't mean to alarm you in any way, just know that even if a false reading of a biopsy is rare - it happened to me.

Do you have a copy of the pathology report? And did you have a tooth that was irritating the area?

It would be interesting to know what your tissue was reacting to.

My situation may be nothing like yours at all, but I'm a little sensitive about the whole thing I guess.