Plaque-type blue nevus combined with lentigo (nevus spilus).

Three cases of plaque-type blue nevus accompanied with lentigo-like changes were reported. The combination of blue nevus and lentigo (nevus spilus) is a new type of "combined nevus", but it belongs to the second type of Kawamura's atypical blue nevus. This combination is unlikely to be rare, not only in plaque-type, but also in common type blue nevus, and to be comparable with the findings of such dermal melanocytosis as nevus of Ota. Histologically, cellular blue nevus was also observed in areas of Case 1.