I was going to suggest lipoma as well Homeboy. I have one right on a rib bone, but it does not cause any of the sypmtoms Confused brought up, except for the fact that it moves and causes pain. I have had one removed and was so miserable with the stitches that I have opted not to have any more taken out. Not sure I could endure a dozen incision sites with stitches.
Confused, the rest of your symptoms leave me, thinking you are on the right track with the docs and tests. You may want to get that lump removed and biopsied itself.