I have a few hens who are missing feathers on their lower back above their tails, for 7 or 8 months already. I assumed from the start that this is the rooster's doing. They've gone through molting and their feathers have come back everywhere but on their backs. One of them is now particularly a concern, as I've noticed that the skin in that area is looking quite raw and there is some blood occasionally. I've tried separating her for a few days and fed her extra protein, then after a few days I let her back into the coop with the others and put some melaleuca gel on her back, hoping it would help heal and would deter the hens from pecking at her. But I saw the other day she was looking pretty raw again, so I've separated her again. I can't continue to do that though - doesn't make her very happy. Any suggestions?