A recent and novel method of melanoma detection is the "ugly duckling sign"[28][29] It is simple, easy to teach, and highly effective in detecting melanoma. Simply, correlation of common characteristics of a person's skin lesion is made. Lesions which greatly deviate from the common characteristics are labeled as an "ugly duckling", and further professional exam is required.[citation needed] The "little red riding hood sign",[29] suggests that individuals with fair skin and light colored hair might have difficult-to-diagnose melanomas.[citation needed] Extra care and caution should be rendered when examining such individuals as they might have multiple melanomas and severely dysplastic nevi.