My nubian doe has a large knot, a little bigger than a golf ball on the back of her udder, actually right below her eustacion (sp?). I don't remember if it came up while she was pregnant or after she kidded. A couple people that we asked said it might be CL. She's never had any problems with abcesses before except a very small one at a vaccination site but it cleared up pretty quick. Could it be a tumor? She has a long udder that is not attached real well, could this have anything to do with it? Her milk looks and tastes great. I would hate to loose the only good milker I have.