There’s just some internet memes that are just too easy to use. The “This is Sparta!” one, while long dead, still rears its ugly head from time to time, especially when you get a glimpse of something like this scarification piece that IAM: Eroswastika recently cut into one of his clients.
It’s hard to say if the owner of the scar is a fan of the comic or the film (or perhaps both), but it’s reasonable to assume he is a fan of Miller’s work.
In case you can’t tell by the photo, the scar is located on his bicep, right above the ditch. You can get another look at it from a different angle by checking out the skin removal scarification gallery.