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Familial malignant melanoma, light micrograph
Light micrograph of a section of human skin showing familial malignant melanoma, a genetic or inherited skin cancer, meaning that the risk of melanoma can be passed from generation to generation in a family. Individuals in melanoma-prone families frequently have moles called dysplastic nevi. Dysplastic nevi are large, flat, irregular, asymmetric, variably pigmented moles, that most commonly occur primarily on sun-exposed skin., Photo by NIGEL DOWNER/SCIENCE PHOTO LIBRARY
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