i have a bloody slin tag on my r.nipple.looks like it is held by a thin skin.hurts.

Hello and welcome to EmpowHer,
From what you shared, I'm guessing you have a cut of some kind on your nipple. Is that correct? In order to avoid infection, keep the area clean and perhaps place a bandage over the area to avoid friction and further irritation.
If you have bloody discharge however, you need to see a doctor right away.
If you would like a more detailed answer please feel free to share more information about your situation.
Faith