Nevus achromicus (also called nevus depigmentosus or achromic nevus) is a benign birthmark appearing as a localized area of hypopigmentation. This light colored spot is often solitary but may be present as multiple whorls or streaks. These areas are stable in their shape and slowly enlarge in proportion to the growth of the child.

Apart from a few reports of associated internal findings, these lesions are isolated to the skin and no treatment is necessary. Care should be taken with sun exposure since this area sunburns easier.