I have decided to add Scars to Jason's body of different times between he was 4 to his capture.

4 Years Old - 10 Years Old

These scars are from when he was abused by his parents and bullied by his tormentors.

10 years old - 13 years Old

These Scars are from his training within the League of Darkness

13 Year old - 17 Years Old

These Scars are his time as a Absolute on missions and during his training.

His Body heals the wounds, but leaves at the scars because he wants them to stay, as a reminder that he survived and pushes harder in combat and training.