Yesterday I went outside to let the chickens out, and I noticed that one of the newer chickens that I recently bought had a entire chunk of skin pulled off!! I believe that one of my older Lavender Orpingtons did that to the younger chicken! I realized that one Lavender Orpington kept on picking one the two newbies. It looked like she was purposely trying to yank out feathers out of her neck! I have some pictures of the younger chicken who is injured. What should use to treat this? And how do I stop the chickens from really hurting each other?