My hen's tail recently began taking on a frazzled look. I've looked at it a couple times, but I don't see any insects. I see my hens occasionally picking feathers off each other, but nothing that looks like pecking at this one. Moulting? She's only 5 months old. When I look close, I see bare skin, feathers that have been broken off, and what could possibly be a sore that is healing. There are also what I think are new feathers. Because I have no experience with chickens, do the following pictures give you any clues as to what might be happening? I tried to get close up pictures of her skin but she would have none of that. All my other chickens have beautiful full feathers. This chicken has also always been the slow, smallest chicken. She's not so slow now, but still quite a bit smaller than the other RIR. Thanks for your help!