SOLVED / Feather loss on one side of hen’s neck. How should I treat it?

[Beetlejunky]

I’m sure this question has been asked a million times but I’m a little stumped and lost. My hen (Beelzebub) who is a copper maran I estimate around 2yr-3yr seems to have some feather loss on the right side of her neck, and in no other locations. She has had this happen before, but it was before I started free ranging my chickens. She lives with 4 other easter eggers and 2 welsh harlequin ducks. The ducks are fairly docile and keep to themselves and often forage alone from the rest of the flock. I did try feather restoration feed (flock shield nature wise), but it didn’t seem to make much of a difference. It seemed to clear up after free-ranging (I started free ranging around the end of May 2025). My only other chicken that has had the same problem is one of the easter eggers (named Spiders). I am pretty sure it was on the same side as well. Since it cleared up after free-ranging I assumed she was possibly being picked on, however since it’s come back I’m not so sure? I would think with how big the property is that they’re allowed to run around on bullying would decrease significantly. Food is plenty (free-feed, and of course all the grass and bugs) and they have multiple locations they can get water. As well she is rather clingy with me and follows me around the yard, almost yelling at me lol. Would someone be able to tell me why she might be losing feathers on the right side of her neck, and how I should treat it? And if there is any further information needed I am happy to provide.

(In the picture, she isn’t panting, she was talking to me lol)
Also sorry the image quality is a bit bad, she doesn’t like me to get too close to her, but there doesn’t seem to be any bleeding or wounds.

 

[MROO]

Have you checked for mites? If it get's better when she free-ranges, there may be "bugs" in your coop. A good deep-clean can't hurt!