From picnics in the park to backyard barbecues, from swimming to sailing, activities under the sun bring joy and a sense of freedom. Unfortunately, they can also expose you to excessive ultraviolet (UV) rays, a major cause of melanoma, the most dangerous type of skin cancer. Here’s what you need to know about this potentially deadly disease, and what you can do to prevent it—or treat it early, when it is still highly curable.

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