I need info on what this is strange little pain on my right nipple ?. Im 18 year old boy and i have a strange feeling pain like on my right nipple. And when i push it down its like i feel a little bump or ball of mass ? Something like it. The left nipple on the other hand is normal. I dont see it on the outside though. Just when i push it it kinda is pain and i feel the bump. What could it be ?