Hi and thanks for using the forum.
It is possible to get a skin infection on your nipple, so you may want to see your doctor about this. You could also try an over the counter antibiotic ointment. Apply some to the nipple and apply a bandaid to the area to prevent your bra or shirt from irritating it further. If this doesn't help, you should see your doctor. Be sure to wear soft cotton bras in the meantime to prevent irritating the nipple any further. Good luck.
Bridget