I discovered a year and a half ago a lump on my left side just below my rib cage. My dr. diagnosed it as lipoma or fatty tumor. Had a ct scan done 1 year ago on my abdomen to make sure there was nothing going on and it came back fine. It has grown since then. Worrying that it may be cancer of some type? My dr. said I could go to a surgeon if it ever started bothering me and have it taken out. Should I be concerned?