Possible depluming mites?

[FridayGirl72]

I noticed a thinned spot on my bird's neck and found a spot with inflamed skin and a chunk of feathers with only the feather shaft present..Depluming mites?

 

[coach723]

How old is the bird? Hen? Looks like possible rooster damage from him hanging on when he mounts. If you don't have a roo, then watch for a dominant hen doing it, which sometimes happens when there is no roo in the flock.