House hangs up and Alvie's hearing begins. House stands up and announces that he is Alvie's doctor and has a letter that proves Alvie's citizenship. Alvie's lawyer reads it to the court, and it shows DNA proof that Alvie is related to his mother, who apparently does have a birth certificate showing that she is a citizen. Um ... I think that's what happened, anyway. It doesn't really matter, since the upshot of this is that Alvie's citizenship is sorted out and he's free to go, so House didn't screw him over like we all thought after all. I don't know why he couldn't just tell Alvie what he was going to do so Alvie didn't feel horrible all night, but whatever. Alvie is surprised to find out that House was able to get some of his mom's DNA off of that cross necklace. So is House, who says he faked those test results. He just did a much better job of faking evidence than Alvie did. Alvie rewards House with a hug and offers to repaint House's entire apartment. I think it's safe to say that House is not pleased with either of those prizes.
Back at PPTH, Sydney is being wheeled into a UV light room, because apparently UV light can treat TB somehow. Doesn't UV light come from the sun? Why didn't that help all those people who died from TB before we invented antibiotics? Sydney's vitals are also crashing and her lungs are failing, but House stops Foreman and Chase to point out a mark on Sydney's ankle that no one noticed before because it's only visible under the UV light. It's a lame tattoo, too, saying just "Eddie Would Go," a surfing phrase. I guess when Sydney gave up surfing, she decided to give up any and all evidence of her surfing past. Except for that framed picture of her with a surfboard. So she had the tattoo removed from the top layers of her skin, but it's still there in the deeper layers, where it only shows up under UV light. Back in Nolan's office, House explains that when Sydney started her intense ultramarathon (Princeton 10K "ultramarathon") training, her immune system went all wonky, setting off an allergic reaction to the tattoo ink that was still trapped in her skin. They just have to cut away the skin with the tattoo ink in it and throw on an ink-less skin graft and Sydney will be fine. And to think, they almost cut out her brain. For no reason. Which would have been the second time they unnecessarily destroyed a patient's memories.