I am concerned about a lump on my left arm about two inches from my elbow. It seems to be on a nerve because it is causing my arm to shake. the lump hurts. The arm only seems to shake from where the lump is down to the wrist. I think another smaller lump is starting about an inch from the other along the same nerve. Any educated opions would be extremely apreciated. I am currently seeking a doctor. I have an apointment first week of next month.