This is taken directly from the CDC's webite.
Skin cancer is the most common form of cancer in the United States.
The two most common types of skin cancer—basal cell and squamous cell carcinomas—are highly curable. However, melanoma, the third most common skin cancer, is more dangerous, especially among young people. About 65%–90% of melanomas are caused by exposure to ultraviolet (UV) light or sunlight.
In 2005, 53,792 people in the United States were diagnosed with melanomas of the skin
Research shows that most skin cancers can be prevented if people are protected from UV light