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https://www.backyardchickens.com/articles/mites-lice-treatment-and-prevention.64597/ Completely clean out your coop, apply permethrine based powder or spray and get all new bedding and litter. Nice coop.

What have you tried so far? Depluming mites tend to strip feathers to the shaft and makes them look ratty, this looks more like normal mites or picking. How many birds do you have for how big a coop? What's their diet?