We have one rooster and four hens and between yesterday and today noticed an area on one of the hen's backs about 2"x1" that has had the feathers removed and is red and has some blood oozing. One of the hens is broody and sitting in the coop on eggs, so she is not involved and we noticed the other two hens keep going back to the injured bird and seem mostly to be removing more feathers, but are pecking in the process. The rooster didn't peck her in the time we were watching. I'm sending to tsc for blue coat, is there anything else we need to do? Any other wound treatment? She seems to be acting normal, eating and doing her normal thing. Do I need to separate her or just try the blue coat? The others don't seem as aggressive as just attracted to the injury and keep going back to it. The birds are about 6 months old and have been together since they were chicks.