Why Do We Have Birthmarks?

Do you have a birthmark? What causes them?

Read More:
'Strawberry' birthmarks grow rapidly when babies just weeks old
http://www.sciencedaily.com/releases/2012/08/120814144939.htm
“Strawberry-shaped birthmarks called infantile hemangiomas grow rapidly in infants much earlier than previously thought, researchers have found.”

Cause of Port Wine Birthmarks & Rare Disorder Found
http://www.livescience.com/29444-port-wine-stains-sturge-weber-cause.html
“A single genetic mutation is the cause of ‘port wine’ birthmarks, as well as a rare neurological condition of which the birthmarks are a distinctive feature, researchers have discovered.”

What are Birthmarks?
http://www.livescience.com/32341-what-are-birthmarks.html
“The term ‘birthmark’ can refer to all sorts of spots.”
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