That tattoo on Ellie's arm tells us a lot about Ellie (obviously)... but also the company she finds herself in. When I asked Margenau about it, he confirmed that "it's covering the scar, the bite mark on her arm, because she doesn't want people to know of her immunity, so she's kind of covering it up." Perhaps when folks find out that she's immune, and that the Fireflies could've potentially saved thousands of people with a cure just by sacrificing her, things might get dicey for Ellie and Joel. How would their fellow survivors react? Unpredictably, that's for sure. If the Fireflies hear a patrol talking about it in the wild they might come for her again, eradicate the entire camp, leaving only Ellie (and Joel?) alive. Hence why she's going to kill every... single... one of them.
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https://www.gamesradar.com/16-exclusive-things-we-learned-about-the-last-of-us-part-2-from-the-co-game-directors/