I Just Noticed A Purple Raised Mole Under My Breast,

I just noticed a purple raised mole under my breast, I am confident this has not been there long; however, I'm not sure exactly how long it has been there. It is not painful to touch, itchy, etc. I did have a baby in May and recently weaned him if that information makes a difference. Should I be concerned due to color, that it's raised and fairly new?