Since you mentioned me as a potential reference re: The Lost Boys vampires and tattoos (I’m oddly flattered to be considered the TLB reference, by the way): no, in the movie none of them are shown to have tattoos–just piercings. However, in theory I think they would indeed retain any tattoos they had from when they were human, and could get permanent ones after being turned (which could be removed by scraping/cutting/etc. off the tattooed skin and letting it regenerate to its natural state).