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a functional developmental defect in vascular filling characterized by pale, round or oval, flat lesions, indistinguishable from surrounding normal skin on diascopy.
nevus anemicusWhite nevus A sharply circumscribed, pale macule on the trunk, neck, or limbs, attributed to a functional defect in the superficial dermal vessels, as these are not affected by vasodilators; NA contrasts to achromic or depigmented nevi–eg, Ito's nevus, due to a focal loss of melanin pigment
A patch of pale skin in which blood vessels are narrowed or contracted and blood flow is locally limited.
See also: nevus