Mites?

[casportpony]

I'll try to get a better picture, but they crawl away as soon as I see them!

When I treat for lice I use permethrin spray or dust

.

 

[SunnyTheFrizzle]

When I treat for lice I use permethrin spray or dustView attachment 1553661 View attachment 1553662 View attachment 1553663 View attachment 1553664 .

I have been using the permethrin spray for a while, but I think the mites have grown a resistance to the stuff. I can't always be where my chickens are to treat them, so the treatment hasn't been as thorough as I wanted it to be. Though I really thought I had got them this time, I guess not.

 

[casportpony]

I have been using the permethrin spray for a while, but I think the mites have grown a resistance to the stuff. I can't always be where my chickens are to treat them, so the treatment hasn't been as thorough as I wanted it to be. Though I really thought I had got them this time, I guess not.

For the lice you have to get the spray on the skin in all of the places lice like, vent, legs, back, belly, neck, and sometime the head.

 

[aart]

For the lice you have to get the spray on the skin in all of the places lice like, vent, legs, back, belly, neck, and sometime the head.

For any pest!

Agrees that OP pics look like a louse by shape, pic not clear enough to tell for sure.

@SunnyTheFrizzle here some tips for bugs check:
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).

 

[Shadrach]

Mites are usually black or dark red, the size of a pin head and move. That doesn't look like anything to me.

Mites are usually grey and a translucent white.

The grey mite keeps it’s colour after feeding, but the red mite is called the red mite because it goes red after feeding on the chickens blood.

In the OP that looks like a louse to me.

 

[Justso]

When my girls had mites I remember reaching into the nest box and there were dark/black specks crawling all over my arms. First time it happened I was ready to cut them off.