We have a leghorn hen that is approaching 10 months. I recently noticed a lack of feathers on her butt. It's not messy or bloody, but I'm worried. As far as I can tell, she still lays eggs, hasn't lost weight, and acts the same as usual. No other chickens in the coop have this problem. After looking around a bit on here, I realized it's a common issue. Many people suggested that it's lice, mites, molting, other chickens (we do have a rooster), or the hen herself, but I'm really not sure what the problem is here: Thanks!