My 6mo old Buff Orpington had a really bad injury behind her left wing. It seems so bad that her skin is peeled away and infected. I've had the 12 hens (different kinds) and 2 roosters (barred rock and NE Red) since they were chicks and noticed that the roosters are getting very aggressive. Could this be from the roosters? Hen pecking? I'm new to chickens and haven't seen this before, nor do I know how to treat it. I feel so badly for her. She's so sweet. I appreciate your help!!