I have been trying to rid my chickens of mites since the end of April. 2 chickens continue to lose feathers on their backs and have very red skin. I have cleaned and dusted the coop and the birds each week. 2 hens are fine. but 2 keep having the bald spot and one is starting to lose more feathers. I have been treating the bald red spot with Vaseline, and antibiotic ointment this week. one is getting better. How do I get rid of!!!!. I have not tried the frontline under each wing yet. but will do tomorrow if it will still be ok to eat the eggs. Help Please I have already lost a rooster to mites and am worried about my hens,