I have had what I thought was a vein in my palm that was about the size of a flatten pea for several years. It never cause me any trouble until about a week ago when it became painful and harder. Shaking hands, changing gears, etc - hurts - not too bad but enough to try to avoid actions that might hurt. I thought it might be a varicose vein but also thought it might be a ganglion cyst. My father and grandfather both had ganglion cysts on their forearms