I've had this for awhile and from what I can remember it really never grew or had given me any problems. As of lately I've had some neck stiffness and a feeling like my equilibrium is off. It is tender to the touch at times. No headaches, memory loss, blurred vision or anything of these sorts. It's on the right side of my head about middle to the ear and just under the skin. Could this be a cyst or lipoma?