I have a new Nubian doe. I noticed her right teat had a dimple in it so I felt it and it was hard. The kids, who are 5 months old and should be weaned but aren't, are only sucking on the other side. Today, I checked on her and the dimple is now an open sore. There are bugs swarming it. I thought it was scar tissue but now I'm concerned that she has a current case of mastitis. I don't know what to do. It looks kinda like an ulcer. She also has hardness in her udder and a lump in her udder. Does this sound like mastitis to you? What should I do with her?