nevus anemicus

nevus anemicus
a congenital disorder characterized by pale, round, well-defined macules with irregular borders that may have a normal or decreased amount of melanin, thought to be due to a functional incapacity of the blood vessels to dilate as a result of increased sensitivity to catecholamines. It is often adjacent to areas of vascular malformation in the capillaries.

Medical dictionary. 2011.

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