Acquired melanocytic nevi in childhood and familial melanoma.

Importance: In the surveillance of familial melanoma, the identification of children at greater risk of developing melanoma later in life would serve as a helpful tool.

Objective: To determine whether acquired melanocytic nevi in childhood are an indicator of risk of melanoma in children from families with familial melanoma.

Design, Setting, And Participants: A 20-year follow-up study of a cohort of children from families with familial melanoma.