A.S.
I had a large cyst in my breast. I wasn't bitten by anything though. I would ask if you can get the cyst aspirated instead of surgery. When they cut out a cyst they take the cyst and the surrounding tissue so if it's her nipple they might have to take the whole nipple off. I'm not trying to freak you out I'm just telling you the truth. I still have the cyst in my breast and I'm getting it aspirated again (2nd time) instead of surgery. That's what I would do if I were you. It certainly won't hurt to ask if aspiration is an option. Or if it doesn't bother her you can just let it be but there is a possibility that the cyst cold get inflamed again. Also I'm almost 100% that a cyst is in it's own sac and if it isn't inflamed or red around the area then it won't spread into your blood stream. If it's irritated though you'll know and they'll just give you antibiotics that's what they did for me.