Several of my girls have raw looking bottoms and chest areas. And the tail feathers are almost gone and gone completely on few. We've checked for mites/lice on them and in the coop but did not see anything. I've put DE on them and in the coop. I've attached a few pictures. Does anyone have any ideas what's going on. I saw one thread talking about "micro" or "depluming" mites and wonder if this is what is happening. The barred rock has no tail feathers and my Easter eggs don't either but they don't have raw spots either. Any ideas?