A benign, acquired or congenital, usually single skin lesion. It can occur on any area of the body, but most commonly occurs on the face of children and the thighs of young females. It is characterized by a proliferation of large spindle, oval, or large epithelioid melanocytes in the dermal-epidermal junction. The melanocytic proliferation subsequently extends into the dermis. The disease is spitz nevus (Monarch Disease Ontology id MONDO_0044793). Also known as: benign juvenile melanoma, juvenile nevus, spindle and/ or epithelioid cell Nevus.