Small muzzle scabs not healing

My dog has two tiny scabs on his muzzle near his right eye.  Each one is smaller than the tip of my pinky finger.  I first noticed them shortly after another dog was staying with us.  The dogs ;play and wrestle, so I assumed Ace just got scratched on the muzzle during play and would heal up soon.  But that was over a week ago, and they scabs have not healed up.  They haven't gotten worse or spread or anything, but they have not gotten any better, either.  He doesn't seem itchy and I haven't noticed him scratching at it (but he certainly could be when I'm not watching him).  Otherwise, he seems perfectly normal. 
 
Do you think I need to vet him for this?  If not, is there some kind of cream or something I can put on there to facilitate healing?