What Causes Blood From Nipples Of Nursing Mother?

Didn't hit it or anything no scratches. I was helping Ali go potty and I felt something. You remember how you felt when you were nursing and started to leak. And so I looked on my shirt (no bra) sand there was a spot and I looked on my nipple and there was blood. So I did what any mom would do...squeezed it and a couple more bright red drops came out. And then that was it. I tried again about an hour later nothing. An hour later a tiny bit of blood. Looked a lil mucousy. And just twice today. Just tiny bit. Sometimes clear sometimes blood. Now it's mostly if I squeeze it - I know I shouldn't do that. I also noticed 4 mole like brown spots on my areola. They are raised, not like Montgomery glands. They are not totally circular.