is "Mongolian Spot"?
"Mongolian spot" (Meng-gu-ban in Chinese and
Mou-ko-han in Japanese) is "a bluish spot found in
the sacral region of nearly all new-born babies of Oriental
races and occasionally in other races, and which usually
disappears in two or three years" (OED 2nd edition).
It is very interesting, even if you are not an ethnobiologist,
in that it reveals that the baby is, at least partially,
of Mongolian* origin wherever it was born and however
skinned it is. On the other hand, since mysteriously it
will gradually fade out as he is growing up, little or
nothing about the uniquely Asian physical trait is familiar
to most of the Western people.
*The word "Mongolian" doesn't necessarily refer
to the Mongolian People's Republic.
Today those with Mongolian spots inhabit a very vast
area from Middle East through Outer Mangolia to Far
East*. But all of the Asians are not Mongolian-spotters:
most of the Japanese and the Koreans are so, while not
so many of the Chinese are: many of the Turkish and
the Tartar are so, while few of the Egyptians are so.
Although such strange distribution is often said to
be because of the Mongolian Invasion in the Middle Age,
it cannot account for the fact that many Mongolian-spotters
live in countries which have never been invaded by Mongolian
nomads. Another explanation remains to be seen.
*Many vistiors to our site have reported that some tribes
of American Indians are also born with the spot.