moulting, bullied or other?

Hi All,

This is our first year with chooks & I have just noticed our Black Rock, Cilla, she has an untidy wing, on further inspection I discovered quite a bald patch underneath, no redness or blood and she didnt seem to be in distress while I was stroking her,
Shes eating well and chirpy enough.

I treat the hen house with mite powder every week when I do the housekeeping for them and the other girls are all fine.
I think she was bullied months ago when we introduced her, but not lately.

Any suggestions gratefully received, do you think she is going through a moult?

Hi Hillfooter,

I noticed the feathers under her wing were not smooth, when I looked she didnt object to me extending her wing & didnt apear to be in any discomfort .
The bald patch is under her wing on the body, no blood or scratches.
She was fine this morning running about with the others as normal & eating.

Its a mystery!
Hope its not something that can spread to the others.
Thanks for any advise.