A port-wine stain (nevus flammeus) is a discoloration of the human skin caused by a vascular anomaly (a capillary malformation in the skin). They are so named for their coloration, which is similar in color to port wine, a fortified red wine from Portugal.
A port-wine stain is a capillary malformation, seen at birth. Port-wine stains always persist throughout life. The area of skin affected grows in proportion to general growth.
Port-wine stains occur most often on the face but can appear anywhere ...
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