Where did Scar's other tattoo come from?
Although I can't remember it being stated, it is most likely, that he found the tattoo in his brothers notes and put it on his arm with the help of Dr. Marcoh.


   The tattoo was most likely one part of the preparations for the 'promised day' in episode 46 (2009), before Scar comes back with Marcoh from the negotiation with the Ishvals.