A case of acquired bilateral nevus of Ota-like macules accompanying the common blue nevus

Acquired bilateral nevus of Ota-like macules is representative among acquired dermal melanocytoses. In contrast to the blue nevus commonly occuring at birth, it can occur in childhood and adulthood. We report a 44-year-old woman, who had developed the acquired bilateral nevus of Ota-like macules and the common blue nevus on the left forearm concurrently for approximately 7 years. The characteristics of late onset and the distribution of sun exposure areas seems to imply a common pathological origin in their development.