I can't seem to figure out why half of my hens are bald. I don't see any bugs, they don't appear to be picking eachother, and I have no rooster in their pen. They are a variety of hens, all about 1 year old. The feathers don't come back. They are sore, but I think it is sunburn (very red in the bald area only). I have cleaned, used Seven Dust, they have a dust bath that they use, an out door run (nowhere close to not enough space) and like I said, no Roo Any ideas??