If you don't already know... I consider you to be one of the knowledgeable and respectable posters!
What I wanted you to know is that post was immensely helpful! especially the chicken wired link.
I'm actually thinking I MITE have this problem.I tried plucking a feather and looking under the microscope but couldn't see anything. So I decided to make an appointment with my vet even though I think the ivomec IS the way to go. Figure since it's my first time dealing with it that it's best to get an actual diagnosis. Visit will cost me $49 plus $30 if we do a skin scrape. Since I have 30 hens, 2 roosters, and 42 juveniles... I cannot afford to mess around with something so serious. I'm hoping for less than 30 day withdrawal. But will also ask about withdrawal time for eating the meat, just in case we ever need to know.
Will update after my appointment tomorrow.
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Your too kind

I hope you are able to get some answers from your vet. If you don't mind sharing what you find, it will be most helpful for future readers.