noun
Mongolian spot; congenital dermal melanocytosis
Medical term for a benign, bluish birthmark commonly seen in infants of Asian, East African, or Native American descent. Often fades by childhood.
蒙古斑は、生まれたばかりの赤ちゃんのお尻によく見られる青いあざです。
A Mongolian spot is a bluish birthmark often seen on the buttocks of newborn babies.
蒙古斑は成長とともに自然に消えることが多い。
Mongolian spots often fade naturally as the child grows.