Three weeks ago I noticed a small lump in the center of my front rib cage, under my breasts. My doctor thinks it is not cancerous, but cannot remember what she suspects it is. I have lost about 38 pounds in the past 6 months and doctor thinks I may have injured the rib cage in the past and just noticing this due to weight, I am now 197 pounds, 5'2" - down from 248 about a year ago. I have been overweight most of the past 22 years. I had a roll-over car accident 15 years ago, nothing since.