Neurocristic hamartoma results from the aberrant development of cells derived from the neural crest. It is a type of dermal melanocytosis. These tumours may contain neuro-sustentacular and fibrogenic components in addition to a dermal melanocytic component. The elements within these tumours reflect the spectrum of differentiation that results from migration of neural crest-derived cells. Identification of these tumours could be important if malignant transformation results in the development of tumours with a distinctive biologic behaviour.