Hen's feathers

[AZ CHICK]

One of my hens is losing the plumage off her feathers. The feathers themselves are not falling out. This has been going on for about 4 months. She seems fine in every other way. None of my other hens are affected. Any ideas as to what it could be?

 

[Kiki]

Can you post a picture of her?
Have you checked for and/or treated for bugs....mites/lice?
Is she laying eggs?

 

[chickens really]

How old is the Hen?...What breed?

 

[azygous]

Is she being mated by a rooster? Favorite hens of a rooster will display stripped feathers.