• Primary melanomas can occur even in dark-skinned people on the palms and soles, under the skin and in the
  membranes lining the mouth, rectum and anus.
• White people with a large number of moles are at increased risk. Those with sporadic dysplastic nevi—unusual
  moles that under the microscope have features resembling melanoma—are probably not at increased risk of
  developing melanoma from those nevi. People with a strong family history, however (familial dysplastic nevus
  syndrome), have an increased tendency to develop melanoma.