Very few characters have non symmetrical textures. Most have one side of the face and that gets mirrored. Exactly the same scar on both sides looks a bit too unnatural.
It's possible to change that, but I don't have the skills for it.
You could repurpose Azkul's head, change the texture. The first caucasian player head (PMHC01) also has a scar, on his cheek.
Both textures are mostly symmetrical but they have a small part with the scar part that goes on top of the symmetrical bit.