A Mongolian Spot, Mongolian Fleck or Mongolian Blue Spot is a benign flat congenital birthmark with wavy borers and irregular shape, most common among East Asians and Turks, and named after Mongolians. It is also extremely prevalent among East Africans and Native Americans. It normally disappears three to five years after birth and almost always by puberty. The most common color is blue, although they can be blue-gray, blue-black or even deep brown.