A woman in her early fifties had regular follow-up for a medium-sized divided nevus of the eyelids which had undergone several surgical excisions during childhood for functional and esthetic reasons. Malignant transformation of the nevus occurred in the inferior eyelid, with the appearance of a new pigmented flat lesion. Histology showed in situ melanoma, and an NRAS activating mutation was found. A full-thickness excision of the inferior eyelid was performed, followed by reconstruction. Local recurrence of the melanoma occurred 1 year after surgery. Lifelong follow-up of divided nevi of the eyelids is recommended, even if very few cases of malignant transformation have been reported so far.
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