Bone Pain from Dentures?

I have had my full set for over a year now and it seems like the jaw bone and top ridge are really sore sometimes. The dentures fit pretty well, I wouldn't really need adhesive on top but use it on both anyway, just in case. I never, with a couple of exceptions, sleep with them in. There are no gum abrasions at all.

The bite seems pretty good, they come together well. The bone pain though is beginning to trouble me. I just went for a checkup recently and the doc said it all looks good. I have one spot that feels like a bad bruise, but she didn't think it was anything. What could it be or what can I do about it?

By Anita