Hi everyone. New to the site but have been keeping backyard chickens for about a year. I have eight layers of various breeds in our coop. This week, it seems that all the girls have started feather picking one of my eater egg chickens. At the base of her back right where her tail starts. I noticed it the other day and put some anti-peck salve on her tail and up until last evening they seemed to be leaving her alone but this morning there is an open wound now and obviously the feathers are gone. The spot is about as big as a dime. We removed her and placed her in our triage pen in the garage. Heading to the tractor supply to grab some supplies to clean it and treat it but definitely interested in people's experience on how best to get her well again and then what to do with the problem overal and ideas about why now all the sudden?