Hello, I have recently noticed that my left nipple will invert with pressure, such as a bra. It has never ever looked like the right one, which looks completely normal (everted). It was always flatter and in the hospital they gave me shells to aid in breast feeding. I am not sure if it has been this way my entire life because I just have not really looked at them as much as I should have. In the last 4 years I had three kid and several huge weight fluctuations, including losing 25 lbs in 9 weeks leading up to this discovery. I also had a mammogram two weeks ago that was normal/clear but it was noted that I have heterogeneously dense breasts. I do not detect any outstanding lumps. There is not much on the web that addresses inverted nipples, especially in a positive way. Thank you in advance.