Sherman,
I would get a referal to a head and neck surgeon or an ENT for a biopsy to be absolutely certain. This is nothing to play games with especially with your past history of smokeless tobacco use. Congratulations on your quitting and your courage to face this right away. There are many reasons for lumps inside the mouth - you'll sleep better knowing that it's benign. I had an oral surgeon, dentist, hygenist and MD not recognize my stage III tonsil cancer. I doubt that you will have to have your jaw removed. The key to success in oral cancer is early treatment.