Rather than telling Neji what it was, Sasuke handed him the pokédex, "That will tell you. From the looks of it, it's your starter pokémon."

And then the mark... Sasuke has to take a breath, scowling at the memory as he's made to lean onto Hiruzen for more support. Normally he'd be more reserved with that information, but he didn't know when he'd run into someone from Konoha again. And Neji, whether he knew him well or not, was an ally, "Forest of Death... Orochimaru cursed me with his bite while I was fought him. From what Sakura's been telling me, it almost killed me."