Okay we had mites got rid of mites with ivomec, de, poultry dust ect. New coop too with lindseed on the perches. I have two chickens that have joints exposed. Someone told me the meds could have made them pick themselves.. and then the dusts. Any how I have one chicken in the house now because she is light and her wing was infected and she was not improving. So we washed wound and put on triple antibiotic. She is doing better but my hubby is concerned they may have a skin bacteria or fungus. We put vicks around the other feathers so she wouldnt pick/preen which seems to be helping. They are all 22 months old and I have read about a molt at this time. One of my chickens IS molting I can see her blood/pin feathers coming in. But we are baffeled about this chicken that I am trying to save.. I mean I will cull if I have to but trying not to. Any help would be great.