The American Academy of Dermatology estimates that more than one million Americans will develop some form of skin cancer this year, and 46,000 cases are expected to be melanomas. Page ContentSun exposure is one of the chief causes of melanomas – the deadliest form of skin cancer. Many people find themselves combating harmful UV rays to protect their skin. And while most people remember to slather sunscreen on their arms, legs and face, there are other places they forget.Dr. Marie Maurice, a board-certified dermatologist seeing patients at Kelsey-Seybold Clinic at The Vintage, breaks down five areas where people raise their exposure risk by failing to apply sunscreen.Dr. Mack-Maurice’s “Forgotten Five”No matter how diligent they are about putting on sunscreen, people commonly forget to protect their hair, the tops of their feet, the sides of their faces, the back of their necks, and their cheek and neck area.The part in your hair. Bald men know to wear a hat or put on sunscreen, but people with thicker hair don't realize they're at risk, too. To protect that part in your hair, use spray-on sunscreen. Also, if you color your hair, this will help you keep your color.The sides of your face. The temples and in front of the ears see a lot of sun damage. That's because people tend to put sunscreen on in the center and smear outwards, so they run out by the time they get to the edge. Instead, dab it all over and then blend. You’ll get as much on the outside of your face as you do in the center.Back of the neck. This is a must for men who usually have short haircuts that don't cover that area.Neck and chest area. The skin in these areas scars more easily and ages faster than it does on the face.Feet. It's flip-flop and sandal season and people forget the tops of their feet. The same warnings apply about skin damage. How to choose sunscreenMexoryl, a popular sunscreen ingredient, can help protect your skin from both UVA and UVB rays. Other brands have photostabilized protection to help protect your skin from burning rays that lead to wrinkles and melanoma.Next time you're in the drugstore, look for a sun protection factor (SPF) of 30 or more with UVA and UVB protection.The difference in SPFsAn SPF number refers to the UVB burning protection a product offers (one with an SPF of 15, used correctly, allows the user to stay in the sun 15 times longer without burning). UVA rays, while not contributing to sunburns, damage deeper layers of the skin and probably play an important role in wrinkling, spotting, lost elasticity and melanoma.It's important to note that the products are lab tested, but testers put on more sunscreen than the average person will. If applying a SPF of 30, you're more likely getting an SPF of about 15, which is why it's that much more important to reapply.Reapplying sunscreenApply sunscreen 30 minutes before exposure. Then, every two hours, whether you're just sunbathing or strolling on the beach, you should reapply. Swimming, toweling off and perspiration can weaken or remove its effectiveness.Pay special attention to your lips. You need a lip balm or lip gloss with a SPF of 15 or more. Clear-colored lip gloss contains mineral oil, which intensifies the effects of the sun. So, if you're going to wear it, put some SPF balm underneath.The “indestructible” Olympic champion and professional athlete Jim Thorpe developed lip cancer. Don’t let it happen to you.