Are there a lot of mosquito's active where you are? They are usually how they get fowl pox. The one on the comb looks like maybe, the others could be pecking injuries, sometimes it's hard to tell. There isn't any real treatements for pox, it's a virus and it usually runs it's course in a few weeks with no real issues. If you want you can dab a bit of iodine on the spots. I'd just keep an eye on them, make sure they continue to eat and drink normally and that the spots gradually heal.