?????

Okay so I have white crusty or dry discharge on my nipples I guess you could call it. Most are saying it's normal but the thing is, is that my nipples have been this way ever since I can remember and long before I was pregnant. But only now did i decide to read up on it and become concerned. Everything I read had to do with being pregnant but they've been this way for as long as I can remember. Why are they like this?