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If you do have some mites or lice permethrin is my go to treatment. It has worked well for me. I have posted this before. I used poultry dust on the birds and in their nest boxes and sprayed inside of the coops, every crack and crevice, on and under the roosts, ceiling, walls, floors, anywhere the pests can hide. It's best to clean out the coop before you spray. I use pine shavings in my coops. I wear special clothing including a mask and gloves. I do weekly sprayings for awhile and put permethrin dust in the nest boxes, originally I sprayed the birds getting under the wings and worked it through their feathers with gloves which you can also do with the dust. If you dust the birds, do it until they look like a powdered doughnut. Permethrin only kill live pests, not the pests eggs. TSC and Amazon carries the permethrin powder, premixed spray bottles and the concentrate. I use the concentrate. It did not affect the birds but I did keep them out of the coops while it dried. I spray my coops as needed and when I spray I do weekly spraying for 3 or 4 weeks then stop as I don't want the pests to develop a resistance to the permethrin. Repeated weekly spraying is necessary because again, it does not kill the pests eggs and as an added benefit is there is no egg withdrawal period. There are other products available but much more expensive, and in my opinion the permethrin works great. Good luck...
I got some pictures of themPics would help.....if you can get good clear ones.
This might too:
My Bug Check notes:
Have you checked them over real well for mites and/or lice?
Google images of lice/mites and their eggs before the inspection so you'll know what you're looking for.
Part the feathers right down to the skin around vent, head/neck and under wings.
Best done well after dark with a strong flashlight/headlight, easier to 'catch' bird and also to check for the mites that live in structure and only come out at night to feed off roosting birds.
Wipe a white paper towel along the underside of roost to look for red smears(smashed well fed mites).
Good post about mite ID by Lady McCamley:
https://www.backyardchickens.com/threads/my-chicken-has-mites-now-what.1273674/page-2#post-20483008