Hi, I m 64 years old. I have a lump on my left biceps. It s been there for 3 years, ony painful to touch, I also get pain however with mostly reaching backwards, in a underarm motion. I have had 3 corticosteroid injections, MRI showed only degeneration in the shoulder joint, a thickness tear in the supraspintus and sub scapularis muscle however i have a lump on the biceps and that is giving me grief not in the areas were the scans say i have a problem. what is that lump?