His "tattoo" is akin to livestock branding. It was burned into his skin. A tattoo can be removed whilst the scar or rather branding like an animal will always be there. It's burned into his flesh. Not only does his scar place him beneath other humans as subservient, it dehumanizes him completely, and puts him in the same category as an animal up for slaughter. The very faction that destroyed his planet, and murdered and spread propaganda about his people. His actual name is Kakavasha