Monarch Disease Ontology id MONDO_0020638 (superficial spreading melanoma) is a type of melanoma that typically occurs in light-skinned individuals ranging in age from young adults to the elderly. Risk factors include extensive sun exposure during childhood, a family history of melanoma, and the presence of dysplastic nevi. Also known as: SSM, cutaneous superficial spreading melanoma, pagetoid melanoma, superficial spreading cutaneous (skin) melanoma, superficial spreading malignant melanoma of skin, superficial spreading malignant melanoma of the skin, superficial spreading malignant skin melanoma, superficial spreading melanoma of skin.