this is a red hen I purchased 2 months ago. I saw this on her then and also noticed that her back was bare from roosters mounting her. Now she's started growing new feathers on her back and due to low energy and her stayin in the coop during the day I moved her to another coop until she's back in the swing of it all. But I noticed this spot again and I need to know what it is. Do I treat it? Or is it a scab? Is it permanent or what?