Which disease has more severe consequences dysplastic nevus or melanoma?

Melanoma: Melanoma is a life-threatening malignancy of melanocytes, pigmented skin cells. Dysplastic nevus may progress to melanoma. Since both of these are usually asymptomatic early in the course, and since melanoma is curable if treated early, routine skin checks are quintessential.

Melanoma: A dysplastic nevus, unlike a melanoma, is not a true cancer. It is best thought of as a pre-cancer, a possible precursor to melanoma that with time may possibly be able to turn into a true cancer like melanoma.

Melanoma: Dysplastic nevi are still benign lesions. People who have had them are at a slightly higher risk of melanoma than other people. Melanoma is however malignant and can be fatal if untreated.