Pacman Jones has NO WORRIES in the days after his airport fight -- he's back to work in the gym and smiling ... without a single scratch on his face.
TMZ Sports broke the story ... Jones was attacked by a guy who works at the Atlanta International Airport on Tuesday night. He successfully defended himself and knocked his attacker out, hard!
At the time, it seemed Jones may have taken some damage in the fight -- but during a workout session on Thursday morning, it didn't seem like he was touched at all.