Hello, I have had a small bump under my breast I thought nothing of until tonight. I assumed it was a pale mole, and I've had it for years. I noticed it had gotten larger and when I looked closely, saw it had come to a head. I squeezed and got a lot of gunk out. Whitish and pretty solid. Is it possible to actually pop something cancerous, or should I assume it's a pimple that's gotten aggravated by my new bras that fit right on top of it? Thank you!