|
|
|
|
|
Skin |
90% |
|
|
Unknown |
5% |
|
|
Eyes |
2–3% |
|
|
Mucous membranes |
2% |
|
|
Remote internal site |
0.2% |
|
|
|
|
|
|
|
|
Clear skin |
65% |
|
|
Pre-existing moles |
30% |
|
|
Age spots (liver spots) |
5% |
|
|
|
|
The first step in learning about melanoma is to learn about moles, common pigmented skin lesions that can be flat or raised. There are two types of moles: ordinary and atypical (the medical term for atypical moles is dysplastic nevi). 10 to 15 percent of the white population have atypical moles. Examples of both types are shown below. Characteristics of each type are summarized in the table beneath the photos.