DD's 10 months now.. and the last 2 days theirs a little lump almost like a pimple but not, on my left nipple and it hurts to brestfeed on.. could it be just that or ..something else...feels like in the early days when i started breastfeeding that stinging throbbing feeling it kills .. i just thought it was weird that its happening now ive never had any problems since then.. has anyone else had this problem?