A benign smooth muscle neoplasm arising from the arrector pili muscle, tunica media of blood vessels, and dartos muscle of the genitalia. It is characterized by the presence of spindle cells with cigar-shaped nuclei, interlacing fascicles, and a whorled pattern. The disease is Monarch Disease Ontology identifier MONDO_0003291 (leiomyoma cutis). Also known as: cutaneous (skin) leiomyoma, cutaneous leiomyoma, leiomyoma of skin, leiomyoma of the skin, leiomyoma of zone of skin, skin leiomyoma, zone of skin leiomyoma.