Rash

[Erin47]

Hi there. I have had, for the past two months, 3 strange looking circular rash spots. One is about 1/2 " in diameter, the other two are smaller. They are completely flat, not raised but slightly red around the rim. They aren't itchy or sore........just there and now it's bugging me. They sit just under my bra line. I have never had a reaction to a bra or anything. I have no idea what this is but would like to get to the bottom of it.

Thanks so much for any feedback!
Erin