Who says theyre a Zabrak thing?
I know I read that the Legacy comics breaks the continuity of the pulp novels, but since its new, officially licensed and checked by Lucasbooks continuity editors then Legacy is the new shiznitz. This whole continuity thing is rubbish IMO anyway.
..and if the Sith are tattooed in an offical product, then tattooed they are.
And here's the rundown on the Sith from the #0 Issue Sketchbook