Molting or depluming mites?

[Ekemp]

Hello! My girls are all just shy of 1 year old, and some of them molted quite a lot this winter. It seems like a couple still have these bare spots above their tail, and I am just hoping for reassurance that it's normal. I've read about depluming mites, and I have a hard time telling the difference in appearance. I don't see any little critters, clumps at the base of their feathers, or anything else indicating pests. No roosters either.

Thank you!

 

[Wyorp Rock]

I do see some new pin feathers coming in.
The location of the bareness along with the pattern reminds me of mounting and/or plucking damage.

Observe to see if she's getting mounted by another hen and/or plucked during roosting.