My husband and I are new to keeping chickens and up til now have had no issues. We went out of town for a week and left a friend to house sit. When we returned we found one hen with extreme damage to the area above her tail feathers. Because we were gone for the week I have no idea what caused the injury, whether the subsequent trauma was self-inflicted or caused by picking. We have 22 other hens and they are all 5 months old. Can anyone successfully treated this level of injury? If so, I would love to know your protocol. Thank you!!