My barred rock has two identical bald spots on her back, on the same spot on the tip of each of her wings. (Shoulder area) They have been there for about 4 months now and she isn't molting. I don't have a rooster so that can't be it. She gets along perfectly with my other hens. Where her missing patches are her skin looks very red and irritated. She is a happy free range hen who eats only organic crumbles, fresh veggies, an occasional scratch. I'd like to get to the source of the problem so her feathers can hopefully grow back! Any ideas?!