I noticed the oddest thing tonight as I was bathing my 12-month old DS. His right nipple is swollen and red. I did a bit of research online and I read that he could have mastitis due to the fact that he's breastfed? Is this possible and has anyone had any experience of it? Should I worry? He is also running a fever but that could be due to a cough that doesn't shift and we've already been to the doctor's several times for it.