Congenital melanocytic nevi

Congenital melanocytic nevi are benign skin tumours with a population-based prevalence of 1-6%. They run an increased life-time risk of transformation into malignant melanoma. Additionally, they can be associated with an invo lvement of the leptomeninges (neurocutaneous melanosis), and may cause cons iderable cosmetic and psychic problems. In contrast to the past, the risk o f congenital melanocytic nevi developing into melanoma is now regarded as w ell-established. Thus, excision is recommended whenever possible. Large les ions which do not allow complete excision should be treated by dermabrasion within the first weeks of life.