Can anyone please tell me what might be wrong with my 2 year old Buff Brahma hen? A few months ago, I noticed that she was losing feathers on her back. I thought it was a rooster problem and found a home for our very large Blue Opington roo. It did not clear up and I thought maybe she was molting. A few weeks ago I noticed that the skin on her wings was getting very red and swollen. I have checked for mites and lice and have not seen any. They free range all day and are locked up in their house at night. I keep DE in the bottom of the nesting boxes and put in on the floor of the coop when I change the chips. Two other hens have started losing feathers on the heads of their wings. I have 20 hens and a black bantam cochin rooster and a silkie/bantum cochin mix. I bought some ivermectin today and am going to give it to them tonight. The Buff Brahma close up of her skin A dark Brahma that has started to lose feathers Another hen that is fine and just finished molting.