I have 1 hen out of my 20 in my flock, that looks like she is losing some of her back feathers. She is pretty red in color, but the 2 spots where she is losing them, looks like they are white. There is no skin expose, and I have inspected her and there are no mites, but I don't know why she would be losing feathers in 2 spots. Her 2 sisters look fine. Is she "molting" and the others havent started yet. I think she might be the one that is starting to brood, but not really sure. I am a newb when it comes to this kind of stuff. Thanks!