Underside all brown from poop, nearly all feathers gone.

[TheMainException]

I have a young chicken, maybe 4-10 weeks old that I got from an auction with a bunch of others. They all look a bit on the scraggly side, but this one is the worst. It's whole underside from under the tail, down the insides of its legs, and up its breast bone is feather-less and the feathers still present are stained brown. I soak him now and again and today tried to rub him clean with a wet towel covered in Dawn dish soap. I have him resting in the garage to stay warm since it's chilly tonight and he isn't dry yet. I figured he would be looking better by now since he's in a much cleaner environment and has some room to run around. Out of the 12 I got, he's the only one like this.

 

[teach1rusl]

If you're pretty sure it's dirt and poop, I'd let him soak quite a bit longer. Put several inches of warm water in a little dish tub, or small plastic tote. Get comfy in a kitchen chair, set that tub between your legs, and hold that little buggar in that warm water for about 10 minutes. Massage some baby shampoo or mild dishwashing soap on his underside. If it's poop or dirt, it's gonna come off. If it doesn't come off after that much time, it's got to be stain.
Seems awfully young to be molting...wonder why all the underfeathers are missing??? Just poor conditions (where they came from)???

 

[TheMainException]

Yea, I definitely don't think he's molting. It's only his underside. I watch him stop what he's doing sometimes and look at his belly like "man, this sucks." I let him soak for a good while and ran water over him, rubbed him down with a soft soapy, wet cloth and put him under a warming light to dry. He hated it, but he didn't struggle much (might have helped that my cat stared him down curiously and even tried to help a few times by slowly reaching over and putting his hand on the chicken's back. It almost seemed like kindness...except, it was my cat, so I know it wasn't).