My DD is 15 months old and has been biting on one side. infact i have a small tiny hole on the underside of my left nipple, i've been letting it air like always as i've had no breast problems with my breasts. but i feel a slight burning from right where my arm ends to my breast i don't feel a lump. but it's been lightly burning for a few days. does any of you know what this may be it's on the same side she bites. trying to get her to stop.