Itching and Losing Feathers

Hello again everyone,

Lester (our Silver Laced Wyandotte) has been frantically scrathings and pecking at herself today and when I picked her up to inspect her she appears to have pulled out lots of feathers from her underside  .

She's been broody for about 3 weeks and we've been trying to keep putting her out of the nest and out into the garden as often as possible.

I've attached some pics of the affected area. Our other 2 seem fine (although all on antibiotics as one of them has an infection - nothing too bad).

I can't see any red mites anywhere around teh coop, but could that be it - she's been sleeping in the nesting box I think.

Any thoughts?

Thanks,

Mark