This is a doe that has only had her 2 kidds nursing. Noticed yesterday she was engorges and warm. When I checked her out it looked like she hasn't been letting the babies nurse that side and with these sores I see why. The other side only had a small place on it that wasn't bad. It was already cracked a little so I chcked to see if there was puss or anything underneath and there was not. They feel like a really thick piece of skin that crackes. They are only on her teats. What could this be and what should I do?