A port-wine stain is a birthmark in which swollen blood vessels produce a reddish-purplish staining of the skin. Port-wine stains are caused by an abnormal formation of tiny blood vessels in the skin. In unusual cases, port-wine spots are a sign of Sturge-Weber syndrome or Klippel-Trenaunay-Weber syndrome. As the child ages, the stain grows with the child and the color might deepen to dark red or purple.
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