Board Thread:Naruto Discussions/@comment-26564074-20150721092328/@comment-26665178-20150721180002

@Action Copy and pasted section from byakugan page.

Unlike other dōjutsu, the Byakugan seems to be available to its users from the time of their birth and does not need to be awakened through any means. Those who possess the Byakugan have very distinctive eyes: when the Byakugan is not active, they have enlarged and featureless white irides with no visible pupils; when the Byakugan is active, the pupils become more distinct and the veins near their temples bulge. Although the eyes of those with the Byakugan are supposed to be completely white, the anime depicts them with slight hints of lavender.

The featureless white eyes are byakugan. Thats just how it looks when the user doesnt have its powers activated. Sharingan users are completely different from this so you can not compare them.

Boruto and Himawari Uzumaki, despite being children of Hinata Hyūga, do not have the Byakugan because Masashi Kishimoto forgot to give it to them. And thats that.