Missing feathers ? Mites vs?

yellowsnow

In the Brooder
5 Years
Mar 8, 2014
13
0
22
Hi. I have a handful of chickens that have been missing tail and back feathers. They free range approx 0-8 hours per day and have a large run when not ranging. I have already tried dusting for mites 1x per wk for 2 weeks and dusted coop as well as changed bedding. I noticed a small bump on a few I will try to post a pic. Does anyone have advice?
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