25%: While skin cancers are common and include mostly basal cell and squamous ca there are about 80 thousand new cases of melanoma occurring every year . In men the median age for developing this lesion is between 45 and 55% divided between men and women almost equally. About 25% of the male cases occur before 40. Rarely congenital cases occur early such as in neurofibromatosis.
Answered 5/3/2014
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