Several of my Roos and a few of my hens have these black spots on thier combs. I have looked up several things they could be and at first thought maybe I had an outbreak of Fowl Pox but these spots do not have a whit lining like the pics I have seen of pox. All my birds are acting normal and don't seem to be bothered by the spots. What could they be, should I be concerned, and if so what do I do to get rid of them? Here are some pics.