I have no leaked anything from my breath my whole pregnancy. Just wanted to state that.

So I got a free breast pump n I have been practicing putting it together n getting use to the feeling. I noticed that my nipples have lil black hard stuff all over them, I can only describe them as a scab you get after a cut or scratch. I pulled a few off, no pain, n some white stuff came out. Then the next morning the scabs are back. I'm so confused. Does anyone know what this is? I'm afraid I won't be able to breastfeed.