Angel has begun to wean the kitten but he was nursing last night and I just checked her nipples yesterday and all looked fine and I could tell he was still nursing at least some because the one nipple she nursed on was still long and red (just the nipple) I let them out to run around and roam the house tonight and when I went to pick her up and put her back in my room there is a square (yes it is square/rectangle in shape) hard mass around the teat. it didn't feel warm but reminded me of what a matt feels like in long fur but she still doesn't have much hair and she is short hair and it was under the skin. is this mastitis???? I am calling the vet first thing in the morning to get her in to be checked but should I try a warm compress tonight? she isn't showing any other signs and was running around playing and is eating and drinking fine......