Mongolian spots are REAL

I told someone recently about Mongolian spots and they didn't believe me.  The fable is that Genghis Khan traveled around and he and his people intermingled with various cultures.  Who knows what the real story is, but the end (har) result is that babies from those cultures are born with this bluish birthmark which does fade over time.  It shocked me when I first saw one but now when I see a Korean baby's bottom (and it doesn't happen often so don't call the police), the blue mark is there.

Wikipedia says:

"A Mongolian spot, also known as "Mongolian blue spot", "congenital dermal melanocytosis",^[1] and "dermal melanocytosis"^[1] is abenign, flat, congenital birthmark with wavy borders and irregular shape, discovered on and named after Mongolians by Erwin Bälz.^[2][3]It is also extremely prevalent among East Asians, South-East Asians, South Asians, Polynesians, Native Americans, and East Africans.^[4][5] It normally disappears three to five years after birth and almost always by puberty.^[6] The most common color is blue, although they can be blue-gray, blue-black or even deep brown."

A Mongolian spot, visible on the lower back of a six-month-old Taiwanese baby girl. (Wikimedia Commons)