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It turns out that Juggalo makeup blocks facial recognition technology
(consequence.net)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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If you're thinking of Darth Maul, that was his face because he was a Zabrak and they sport facial tattoos. Facial tattoos aren't a necessary feature of the Sith.
Are they tattoos? I thought Dathomiri Zabrak just had skin spot patterns?
From wookiepedia:
Elsewhere
Neat.
In one of the books it talks about him earning the tattoos. I think they were related to sith alchemy or rituals but were fairly niche among the sith. Palpetine was a weird one even for the sith it seems.