Multiple painless bumps in mouth?

My husband has dipped smokeless tobacco for about 7 years. He’s now 22 and after many times trying to quit, he seems to be doing pretty well (3 days without it, which is better than he’s done in the past). At most, he dipped ½ can a day, but normally not even that much. He has no history of cancer in his family and has always been healthy.

About six years ago, he had to have a bunch of dental work done – root canals, crowns, etc. Back then, he noticed a bump on the floor of his mouth under his tongue. He asked his dentist back then and he told him it was trauma. It hasn’t changed in six years and it doesn’t hurt, but the dentist said it MIGHT go away and it hasn’t. I thought it might be scar tissue, but I’m not sure.

For at least a year, he’s also had one bump on the inside of both of his cheeks (no, not the ones by the teeth that are supposed to be there). I can’t see them, but he can feel them. They also haven’t changed since he noticed them, and they also don’t hurt. In the past week since he planned to stop dipping, he’s gotten a little anxious because he discovered a new bump next to one on his cheek. He isn’t sure if it’s been there a long time or not because it’s not a part of his mouth he normally feels with his tongue. It’s the same as the others.

He’s got a dentist appointment on Wednesday, but I’m really worried. None of these bumps look scary like the oral cancer pictures I’ve seen and, like I said, I can’t even see the ones on his cheeks. I’m just so worried that it might be something bad caused by the dipping. There’s nothing suspicious on his tongue or gums where oral cancer normally shows up, he doesn’t have a sore throat or trouble swallowing, and he hasn’t lost any weight.

I know no one here can tell me if it’s cancer or not, but maybe someone knows more about this stuff than I do and can maybe put my mind at ease. He’s so young, and I know oral cancer is most prevalent in those 60 and older, but I also know cancer doesn’t discriminate. He’s always had issues with frequent canker sores, but these are totally painless and, it appears, not going away. Any thoughts on what these bumps might be?