If the lump is still there in 7 to 10 days then see an oral surgeon for a definitive diagnosis. I think it is appropriate to check these things out but in all likely hood it is nothing to be concerned about.
Sorry, I also wanted to ask if it was possible that it could be a bug bite? The thought of that is gross but it seemed like it may be a possibility.
you did not disclose your age, but being a non smoker (and hopefully you never used any tobacco product) it is probably not cancer. but it does need to be checked by an oral surgeon for a definitive diagnosis, and to hopefully ease your mind.
it could be a canker on your tongue. it will go away within a week