Wow, now this is a giant nevus! I don't think you can get much bigger than that! This image is from the New England Journal of Medicine (NEJM) and it's appropriately titled, "Giant Congenital Nevus." Supposedly, a 17-year-old teen presented with painful swelling of the front of his chest after a roadside brawl. He had been born with a birthmark on his chest that had grown steadily to its present size. Can you imagine waking up with this on your chest? To read the full story on the NEJM, click here.