Panicking and looking for advice, I just found this flat light brown patch underneath my nipple where my bra underwire sits. 
It’s slight raised, feels smooth, doesn’t to hurt to touch or rub and I cannot feel any lumps or see anything else. Not a clue as to what it could be but obviously my mind goes straight to Cancer and so does google when I tried looking this up. I had my baby 2 months ago so not sure if this is a pregnancy related thing although I’m not breastfeeding. I am booked in to see my doctor but I’m trying not to worry myself sick.
Any advise would be greatly appreciated.