I bought an 11-month-old hen from a local breeder to keep my one chicken company. When I got her she had a bare patch above her tail with a few straggly small feathers poking through. She does not have bugs. The skin is not black. This area has not healed. Sometimes the skin is slightly red. A couple of times there has been a blood spot - I think my other hen has pecked her. I want to put something on it to help the area heal. What can I use? She can preen there so it has to be something she can ingest.