Season 1 Episode 9: HOMECOMING - Ando has a bruise above his right eyebrow after being beat up by the Poker players.

Season 4 Episode 8: ONCE UPON A TIME IN TEXAS - When Hiro teleports back in time (to the time of HOMECOMING) to save Charlie, he talks to Ando in the Diner, but Ando does not have the bruise!