it is fake i believe, i read an earlier post which stated he got the scar in the bronca divide and i think he did when all the men on the base went mad and turned into animals i rescently saw this ep and i can confirm he first got the scar in that ep from season 1 i think its fake for the show, how obsessed are the writers with bringing up past material in the show, ide say very and this scar is rather small but perhaps something they want to keep in the show for some reason unknown to me.... and well the fact that we all notice it is pretty damn mad if u ask me! its only a scar