It isn't a freckle because it wasn't there before. I don't know if it's a scab because I don't see how he could have hurt himself, I let him out for playtime and he didn't have anything. I tried wiping it off with a wet tissue but its stuck :/
I was thinking the same thing. Dany had a mark like that a while back and it did turn out to be a scab. It healed up in a few days. I would give it a couple of days and see if you see any kind of difference in its appearance.