I've been fortunate enough to breastfeed this far without any trouble but now have a lot of soreness in one nipple - it's sore for the first few minutes when my baby latches on, and then sore after the feed is finished. It looks fairly ok except perhaps slightly pinker/redder than the other one and there's one whitish mark right on the tip of my nipple, a bit like a spot which can't be squeezed.
Any ideas what's happening? It doesn't help that he's teething right now and wants to comfort-feed waaaaaay more than normal...