Board Thread:Theories and Speculation/@comment-25758952-20161108201740/@comment-30323490-20161108203417

Ravenlot 27 wrote: I think it was repeatedly implied throughout the series that the markings are the result of the Nine-Tails chakra influence. Naruto, its Jinchuriki, has it, as well as Kin/Gin brothers (who also got its chakra and power) and even Naruto's own children.

Yea, but for instance Kushina didn't have them, and she was Kurama's Jinchuriki for at least a decade.Same with Mito. But i guess the 9-tails influence is the most logical explanation.