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Cumulative sun exposure causes mainly basal cell and squamous cell skin cancer, while episodes of severe sunburns, usually before age 18, can raise the risk of developing melanoma. Other less common causes are repeated X-ray exposure and occupational exposure to certain chemicals.

Over time, being in the sun often – even if you don't burn – can lead to skin cancer. Dark-skinned men and women are not at risk for sun damage and skin cancer. False. Though naturally dark people have a much lower risk of skin cancer than fair-toned people, this does not make them immune to skin cancer.
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