Abstract
Melanonychia may occur in all age groups. Melanonychia is more common in adults than in children. The peak age of incidence of nail unit melanoma is 50–70 years. Nail unit melanocytic nevus with longitudinal melanonychia is more frequent in children than in adults. African–Americans present a higher incidence of longitudinal melanonychia. Nail unit melanoma is more common in dark-skinned subjects. Nail melanoma in children is rare.
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