On two occasions in the past month i have noticed my left nipple has been inverted. It returns to normal after a small squeeze, no coaxing at all. There's no pain or anything like that. I stopped breastfeeding my daughter 5 months ago and that was her preferred breast. There is still a few drops of milk can show if i squeeze both nipples but I'm sure that's normal. I just wonder if this is can happend after breastfeeding or is it a symptom of breast cancer. All this awareness recently has me worried.