I am not breast feeding. I have not breast fed for 8 years. Over the past few months my nipples are staining my clothes. Especially tank tops with built in bra. They will leave circular stains through both layers. I'm not leaking any visible fluid. Anyone ever had this happen or know why it's happening to me?

Have you had your prolactin levels checked? Its a bloodtest.
I have experienced this with all my post pregnancies (years after).

Sorry if tmi....I don't "leak", but I can squeeze milk out still and experience the staining of the bra and I DID NOT nurse any of my kids.

I just had a prolactin level test done and it came back fine. Dr. said not to stimulate breasts , and to wear a good fitting/supportive bra.

Hope that helps, sorry reply was kinda late. Good luck!