One of my six 10 month old girls has lost a group of feathers from her Cushion in front of the tail feathers, she is pictured in my avatar tothe left and is one of two Brahma’s who live with two Rhoad Island Reds and two Barred Rocks. If "she" were a "he" it would be the saddle area of the back. It doesn't appear they are pulled out and I don’t see any of the birds fighting/pecking at each other. Her skin looks red and sore where the feathers came out. when going from the coop to the outside enclosed pen they all crouch down to go under a raised lexan panel that can be lowered closed in extremely cold weather or if I need to keep them in the coop. They do occasionally rub this area of their back going in and out but I have never seen them lose feathers or be bothered by rubbing along it. Can't see any infestations of bugs that may cause irritation, i.e. mites/ fleas that sort of thing . She is active, appears happy and is laying so I don't think it is a molt yet due to age and location of initial feather loss. I'll try to post a picture of the skin/sore on her back. Any ideas on what to look for or how to treat the sore looking skin?