These spots developed quickly over the last few days. My W.Leghorn pullet has a huge comb, and she seems to have the worst of it. I will take more pictures in the morning, I just noticed it tonight when i was putting them to sleep. From the clusters, I would assume it's mites. Tomorrow, I will check the infected birds over fully and try to seperate them for a few days. Any clues? Note: I have been fending off the chicken cage from racoons, opossums, and feral cats..could they have brought this to them? They have been quite healthy and mite free since day 1. I was EXTREMELY surprised to see how quickly this developed.