I found a lump under my left breast on the top of my ribs under the skin about 7 years ago while I was pregnant. The doctor took one glance with his eyes and said it was just a "Fat" deposit. I have noticed just recently it has gotten larger although I have lost a bit of weight over the years. It actually sticks up about 11/2 to 2 inches higher than the right side while laying on my back. Is it infect just a "fat" deposit which I shouldn't worry about or could it possibly be something more concerning?