Aww, I'd definitely check with your pediatrician or lactation consultant about that one, mama, white spots on the nipple can be a few different things, from milk buildup to a fungal thing, at iba pa, kaya mas safe na makita ng doctor para sure. One of my mum friends had something similar and ang lactation consultant niya agad na naka-advise ng proper care, so don't worry too much pero better to get it checked soon para ma-treat agad if needed. How's baby feeding otherwise?