Do you think these black spots are due to fighting or something else? I don't see yellow poop. I've noticed that the poop is a little watery. No one is acting lethargic. I haven't wormed them. They are about eight months old. Do you have to use the crop method for worming?
Have they been sparring? The first shot looks like a localized infection. Others look like they might have `taken some beak' (so to speak). You can daub a bit of betadine or plain neosporin on them and observe for changes. Don't know your location, but in temperate zones Dry Pox usually shows up in the Fall (and it really doesn't really look to be pox).