Hi, Is the lump in your skin? If it is its more than likely a sebaceous cyst I,m prone to getting them for some reason. You can have them removed if is a cyst . I had one removed a couple of years ago. Quiet a simple procedure they just inject local anaestetic and cut it out . I,ve presently got two one on my back and one on the side of my breast under my arm. If it isnt in your skin I,d definately go back to your Dr for a clearer DX of what it is. Take Care Chris