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Mongolian spot noun

  • A benign, flat, congenital, usually blue to blue-black birthmark on the lower back with wavy borders and irregular shape, prevalent among East Asians, South-East Asians, Polynesians, Native Americans, East Africans, and the Turkish people. It normally disappears three to five years after birth and almost always by puberty.
 melanocitosi dèrmica congènita a la regió lumbar, taca blava de Mongòlia, taca mongòlica
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