So the LORD scattered them abroad from thence upon the face of all the earth:
and they left off to build the city.
Genesis 11:8
One can see in the article below that the ancestors of the Ainu had at some point, when a very small group obviously, had a female who began the practice of facial tattoos of the lips. May have been the younger sister of their patriarch of their clan as they traversed central Asia and multiplied....How or Why did she first do this, whoever she was?...Who knows.....
"Until very recently (the last fully tattooed Ainu woman died in 
1998),
Ainu women retained a tradition of facial tattooing...For the Ainu, tattooing was exclusive to females, as was the
profession of tattooist. According to mythological accounts, tattoo was brought to earth by the “ancestral mother” of the Ainu Okikurumi Turesh Machi who was the younger sister of the creator god Okikurumi."
JapaneseMythology&Folklore
And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things.
Romans 1:23
We also see, as happened to nearly everyone, they turned away from God on their trek at some point and began to worship the Creation rather than the Creator--to worship what they could see around them.
"The indigenous people of northern Japan call themselves “Ainu,” meaning
“people” or “humans” in their language. Recent DNA 
evidence suggests
that the Ainu are the direct descendents of the ancient Jomon people....Archaeological evidence in the form of ceramic sculpture supports
this view, but it also suggests that particular animals (bears, whales,
owls) were highly revered and possibly worshipped as deities.
Among the
Ainu, all natural phenomena (including flora, fauna, and even inanimate
objects) are believed to have a spiritual essence, and particular
animals (e.g., brown bears, killer whales, horned owls) continue to be
honored in ceremony and ritual as “spirit deities” called kamuy.
Jomon artisans also created anthropomorphic figurines (dogū)
that were probably used by individual families for protection against
illness, infertility, and the dangers associated with childbirth.
Markings on the faces of many of these dogū likely indicate
body painting, scarification, or tattooing, and similar figures carved
more recently as rock art or into masks by indigenous people of the
lower Amur River basin of the Russian Maritime Region suggest an ancient
and unbroken tradition of personal adornment and ritual practice."
JapaneseMythology&Folklore