[Follow-up and ultrastructure of plaque-type blue nevus]

A 46-year-old patient suffering from a plaque-type blue nevus of the right neck and ear region is reported. The clinical behavior over 28 years and the histology and ultrastructure support the benign nature of this extremely rare variant of common blue nevus. Periodic observation is therefore recommended, and excision should only be performed in cases causing cosmetic problems.