a minor disfigurement or blemish on a person's skin at birth; nevus.

1570–80; birth + mark1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
birthmark (ˈbɜːθˌmɑːk)
a blemish or new growth on skin formed before birth, usually brown or dark red; naevus

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

birthmark birth·mark (bûrth'märk')
A mole or blemish present on the skin from birth; a nevus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


congenital skin lesion, or birthmark, caused by abnormal pigmentation or by proliferation of blood vessels and other dermal or epidermal structures. Nevi may be raised or may spread along the surface of the skin. In other types, such as the blue nevus, proliferative tissue is buried deep within the dermis, the lower layer of the skin

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Pigmented birthmarks are areas in which the color of the birthmark is different
  from the color of the rest of the skin.
He kept looking at the smoothness of her skin, down her thin neck-a birthmark
  at the protruding bone.
See a doctor if you have a mole, birthmark, or other pigmented area of skin
There is a light brown birthmark on the center of her forehead with small moles
  on both sides of the nose.
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