How did maino get the scar on his face?

Answer 1

Some say he inflicted the wound himself, others say it was an altercation with a fellow inmate where Maino cut him and then later the inmate got Maino back.

Other (not so reliable) sources say he was bitten by a cougar.

Answer 2

When he was in jail, he got into and altercation where he cut a guy face and later on that guy caught him slipping and cut him back accross his face.