I have been having trouble with my copper maurans feet for awhile now but they have gotten worse. He has bumps and sores on his feet now. Just the top the bottoms are fine. There are crusty bumps and when explored I found curled up feathers and almost like a thick cream colored oil. I have treated him and the coop with poultry dust. I have used ivomec and they just keep getting worse. The hens in the same pen don't have any problems with there feet. They have bare red butts but I think I have a bully. They have been treated the same as the rooster. I think I figured out the bully and have her moved. The other pens in the same row have no problems feet or feathers. Idk what could be going on. I attached some photos.