Roo missing feathers, scab and red skin

[Thomps Hens]

We have a 6 month old Barred Rock Roo and noticed a few weeks ago that on his behind he is losing feathers and has red skin on his butt. Since there were feathers coming in I just thought it may be a molt, but now it is continuing further down and now up on either side of his tail as well with a scab on each side. Also noticed a small spot of green skin on the side by his tail where the feathers are missing. Is this normal? I always thought chicken skin was completely yellow. He eats well and acts just as rotten as ever. Please see the attached pics. Lice? Mites? Plucking? We have 9 hens in addition to this Roo and none of them exhibit any signs of feather loss etc. I use DE in the coop and run...should I dust with Seven or is this not a parasite?

PIC #1 This is just above the vent
PIC #2 This is below the vent leading to the underside
PIC #3 This is on either side of the tail like where the hip would be.

 

[veramoomoo]

she is just molting!!! mine have that too, it is just a stage!!

 

[Thomps Hens]

I wouldn't think that the area on His backside would be so red though if he was just molting....

 

[Thomps Hens]

Any ideas?

 

[Eggcessive]

It could be mites or he could be picking his own feathers. I would look closely on his skin and especially after dark with a flashlight. The chicken or red mite only comes out at night. There is a certain disease that can cause a chicken to pick there own vent. Another chicken may be doing it. If you sit with them for awhile, you might notice what is going on. Make sure they have at least 16% protein, plenty of room to roam, and some things to do to prevent boredom.

 

[Eggcessive]

Here is some information about amino acid deficiency causing feather picking: http://msucares.com/poultry/diseases/poultry_feathers.html