I believe my flock has favus. We've had some bitter cold days, then the temperature would jump to the high 50s causing a thaw. This caused the air to be very damp for a few days. I suppose it doesn't matter how well ventilated my coop is if the air seems so thick you could cut it with a knife! I bought some Monistat to treat combs and wattles (maybe earlobes too - not sure). It came with an internal cream, and an external one. Does it matter which on I apply? The tube of external cream is pretty tiny, so if I'm limited to using just that type, I'm going to need to make another trip to the drugstore! Thanks in advance for your insight!