Weird mole on my boob?

I've had a mole on the side of my boob for as long as I can remember but a few years ago it got a little darker and it itches all the time. Occasionally it even looks like it's flaky and peeling. It isn't exactly even but it isn't crazy shaped either. I'm pregnant and I'm scared that I shouldn't ignoring the pain in this boob. Any input? Advice?