Chickens have mange?

[superhondaz50]

My chickens are looking really mangey, like an old desert coyote. They are missing lots of feathers around their vents, backs, necks and heads. One is almost featherless. Other than that they seem healthy and lively. They have a sand/ash/de dust bath, flock block to keep them busy, fresh sand in the run pine shavings in the coop, but no matter what they still look tore up. I checked them today, and I don't see any lice or bugs on them. Their skin does look dry. I'm kinda at a loss. Any help?

 

[drumstick diva]

Could they be molting? Pictures would help. I am not aware of chickens getting mange. They could have reddened skin from mite damage.

 

[superhondaz50]

OK, I will take some pics hopefully tomorrow evening. Can you see mites?

 

[superhondaz50]

Well I got home after dark and couldn't take pics, although I found one chicken dead in the coop. I assume I may have some kind of major issue going on with them...