An aggressive malignant smooth muscle neoplasm, arising from the skin. It is characterized by a proliferation of neoplastic spindle cells. The disease is MONDO_0003362 (cutaneous leiomyosarcoma). Also known as: cutaneous leiomyosarcoma (disease), leiomyosarcoma of skin, leiomyosarcoma of the skin, leiomyosarcoma of zone of skin, skin leiomyosarcoma, zone of skin leiomyosarcoma.