Board Thread:Episode Discussions/@comment-1926479-20160705151842/@comment-25549954-20160706174451

I think when people like Neji or Ao activate a Byakugan their vein bulges, they normally have Byakugan without veins, we have not seen how a Byakugan began to appear on a newborn, they might just be without veins, only voluntary actions make the veins appear around their eyes. Himawari's first activation is not just activation it going from blue eyes-> Byakugan->activated Byakugan-> Blue eyes (end credit scene)