I'm posting here, I'm in the need of a rooster, ours passed away the other day. He has to be 1 month or younger.
Ct. Or ma. Only.
My hens need a man soon, they free range, I have about 14. So they are pretty sad.....
Purchase a commercial poultry parasite treatment. There are a number to choose from, such as Permectrin, Ravap or Rabon. You can find them at any farm supply store or purchase online.
I found this online
I would first separate this hen from the others. Clean the coop well bedding and all.
It may also be fleas. I would clean the hen well. IMO it's ok to bring her indoors and clean her with soap/water mixture. Don't mix her with the others till your certain it's gone.