Mine have the bare sots too. I can't see any mites. I even read about some that only come out at night and went out there and examined with a flashlight, and could see nothing. Are mites visible? What would they look like? We have no roosters, and none of the chickens are pecking each other, so that can't be it. And, out of my 6 hens, one has NO missing feathers, and oneonly has a small patch. If it was mites, I would think it would affect the whole flock...?
Can a particularly hard winter affect moulting? Just wondering, because we had the worst winter ever.
Also, if this is moulting, how long does it last? My chickens have had this for nearly 2 months now. I don't see much sign of any regrowth, but I don't know exactly what to look for; we are new to chickens.