Every year more than one million cases of skin cancer are diagnosed. In fact, skin cancer is the most common type of cancer, accounting for nearly half of all cancer cases in the United States. Take extra precautions this summer to avoid becoming a skin cancer statistic.

Sunscreen is a must when in the sun, but getting the most effective sunscreen may be tricky. According to the American Cancer Society, "The Sun Protection Factor (SPF) describes how long a product will protect your skin, if you apply the sunscreen correctly." Based on the fact that fair-skinned people begin to burn in about 15 minutes on a sunny day, here’s the formula for determining how long your sunscreen will protect you:


SPF 15 x 15 minutes = 225 minutes, or about three hours and 45 minutes
SPF 30 x 15 minutes = 450 minutes, or about seven hours and 30 minutes


Although this formula is used to determine how long sunscreen should last, the American Cancer Society recommends reapplying it every two to four hours. Keep in mind that those with fair skin should be extra cautious, and may need to reapply sooner.

To help protect your skin against ultraviolet rays, also consider these tips:

• avoid staying out in the sun from 10 a.m. to 2 p.m., when the sun’s rays are the strongest;
• always wear sunscreen, even in the shade;
• use sunscreen with SPF of 15 or higher that blocks UVB and UVA light;
• apply sunscreen 20 to 30 minutes before going outside, allowing time for it to absorb in your skin;
• apply a generous amount (about one ounce, or the size of your palm);
• pay close attention to your ears and back of your neck, where skin cancers commonly develop;
• apply sunscreen before applying makeup or insect repellent;
• reapply after swimming, sweating, or wiping yourself off with a towel;
• wear a wide-brimmed hat and sunglasses to protect your face; and
• use sunscreen lip balm.

To learn more about skin cancer, and how to prevent it, visit the American Cancer Society’s website.