Ok, so my roo has 2 white powdery spots on him, and a few black spots. At first I thought it was just picking but then I saw the white spots. He is very lively, poop is normal, and he still hangs out with everyone. I also have a hen with a few black spots on her. She acts normal though. They are both about a year old. So, here are my questions! 1.Is this favus or just picking? 2.I have some Nystatin...can I use it on them if it is favus? Thanks in advance!