I am not a doctor. However, my little girl stuck herself in the nipple of her left breast. It was warm, painful, and swollen. I took her to the er and she ended up being okay. Find out if your daughter poked herself with anything by accident. Regardless, you are worried so take her to the er. Follow up with that doctor on monday
I had a tiny bump, almost pimple like on my left breast a few years ago. My doctor told me it was nothing. Well it was. If you are concerned please go get checked out. If you don't then it is always good advice to keep an eye on it.
God Bless