Yes you do have mites (not you personally as they don’t like people

). It’s the small white fluffy stuff where the feathers meet the skin.
Symptoms generally include …
- Dirty feathers around or near the vent
- Slow moving chickens
- Comb becomes light in color
- Egg production lowers
- Weight loss
- Change in food intake
- Chickens pulling feathers
- Scabby or irritated skin
- Bald spots
- Rough looking feathers losing their color
- Seeing bugs crawling on the skin or nits in feathers
I know that my girls got it from farm hay from a neighbour but it can be caught in lots of ways.
It is nothing to do with how you care for your hens or how clean your coop is. In otherwords don’t beat yourself up about it.
I treated mine with xeno450 which is basically ivermectin. Many say use diatom. But for me it would take too long and be too much of a faff.
Hope this helps.