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mongolian spot

n.
  1. Any of a number of dark-bluish or mulberry-colored spots on the lower back, observed in newborn infants, that enlarge for a short time after birth and then gradually recede.blue spot
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.