

He usually looks like this

He is such a beautiful boy. He is an Australorp.
He is about 8 months old, he has reg wood shavings in the coop, they have roost poles but usually stay out in the fenced in in chicken yard. There is another younger roo but they grew up together and have never fought. I am home with them all day. I just noticed this today. It is a new thing, although he runs after the hens a lot so that is why I may not have noticed it earlier. But I am with them every day. It doesn't seem to be bothering him. I couldn't see any lice or anything but I have to look in better light.
Does anyone have any ideas? I would appreciate it.