I don’t see mites..should I treat anyways?

[TheFloralChickens]

I’ve had a hen missing neck feathers for a while now - I’ve posted about her before. I came to the conclusion she was being plucked by another one of the hens. But now I have a couple more hens missing neck feathers within the past couple weeks. The feathers on their back are also messy/fluffy? Almost as if they are being mated too much but I don’t have a rooster. 4/7 hens have the messy feathers on their back and 3/7 hens are missing some neck feathers.
It does look like they have dandruff.

So now I’m assuming mites? But I’ve checked and checked and can’t find any mites on the hens, on the roosting bar, or in the nesting boxes. Would it be safe to treat for mites even if they don’t have them? What treatment would you suggest? I use lime in the coop, run, and dust bath area once a month.

Neck feathers missing and scruffy back:

Scruffy back:

the hen missing the most feathers:

 

[sourland]

The hen or hens in perfect feather are the ones doing the feather plucking. Pin Less Peepers can be use to stop and even break this bad habit.

 

[TheFloralChickens]

The hen or hens in perfect feather are the ones doing the feather plucking. Pin Less Peepers can be use to stop and even break this bad habit.

so you think it’s just feather plucking and not mites? I know which hen would be doing the plucking. But I assumed since it’s on so many of them now that it had to be from them scratching/mites. I’ll definitely try the peepers on her - thank you!