"Up to 90 percent of skin cancers are associated with UV exposure," said Dr. Elizabeth Hale, a clinical associate professor of dermatology at the NYU Langone Medical Center.

Here are some practical tips on keeping every body part safe on Fox News channel:

Legs

Women are more likely to develop melanoma on their lower legs and men on their backs, probably because men take off their shirts in summer while women bare their gams.

"For everyday, a body lotion with SPF 15 is better than nothing," said Dr. Joshua Zeichner, director of cosmetic and clinical research in the department of dermatology at Mount Sinai Medical Center in New York City. Beach days require an actual sunscreen. Don't forget your feet—they're at risk for melanoma too, and very exposed in sandals.

Back and arms

These are also prime spots for melanoma. To help them (and every inch of you) stay protected at the beach or pool, slather on SPF at home in the buff, Hale said.

Have your partner or a friend do your back, from the tops of shoulders on down. Rays can still penetrate the fabric of a one-piece, particularly if it's an older suit that's wearing thin.

If nobody is around to lend a hand, use sunscreen spray with a 360-degree nozzle to reach behind you. 

Neck and chest

Cover the entire region with sunscreen, including the sides of your neck.

"The area under your ears is particularly susceptible to aging and cancer because it doesn't have the benefit of the shadow of your chin, which gives the front of your neck some protection," Zeichner said. If you're wearing a ponytail, be sure to smear the back of your neck.

Face

 It's a common spot to develop basal and squamous cell carcinoma, the most prevalent forms of skin cancer. 

"Don't count on your makeup," cautioned Hale: It may contain SPF, but you probably won't apply enough to achieve a significant level of protection.

Your best bet is a sunscreen that's lightweight and oil-free, especially if you're acne-prone. 

Eyes

 If your regular sunscreen brings on redness or tears, try a formula with zinc oxide or titanium dioxide, both of which are unlikely to irritate eyes. Wear sunglasses that block 100 percent of UV rays, the best defense against cataracts and other eye damage caused by rays.

Lips

Your ideal shield: SPF 30 lip balm. If there's none handy, use a matte lipstick. Avoid glossy lip colors if you're spending a lot of time outside, noted Hale: Gloss—even if it has SPF—intensifies the sun and can increase the damaging effects of UV rays like baby oil can.

Scalp and ears

Scarily, skin cancer on areas with little fat is more apt to spread.

"Dip a cotton swab in SPF lotion and paint it on your part and ears," suggested Dr. Francesca Fusco, a dermatologist in New York City.