A few years ago, I noticed that I started getting dark bumps on my left breast on the left side. They dont hurt when they come however if I wear a bra with a wire in it and it happens to sit on the bump, it gets a little irritated. I heard that it sometimes may happen during menustraton time. I noticed a small one when I got my menustration last time, but i dont always recall them coming around that time. I got one on my left breast now that came in a few weeks ago and have subsided but still have somewhat of a rise in it. Should I be concerned?