A benign primary melanocytic tumor of the skin that presents as a dermal nodule. Morphologically, it is characterized by the presence of paraganglioma-like features that include a nested growth pattern of the tumor cells. The nests are composed of epithelioid cells and are separated by delicate fibrous strands. Cytoplasmic melanin is not present; however immunohistochemical studies have confirmed the melanocytic lineage of the tumor cells. [from
NCI]