How To Apply Sunscreen

These five tips from board-certified dermatologists tell you which type of sunscreen to use, how to apply it correctly, and when to reapply:

1. Choose a sunscreen that has an SPF of 30 or higher, is water resistant, and provides broad-spectrum (UVA and UVB rays) coverage. When this sunscreen is also a tinted sunscreen with iron oxide, you better protect your skin from developing dark spots. Iron oxide protects your skin from the sun’s visible light.
2. Apply sunscreen before going outdoors. It takes approximately 15 minutes for your skin to absorb the sunscreen and protect you. If you wait until you are in the sun to apply sunscreen, your skin is unprotected and can burn.
3. Use enough sunscreen. Most adults need about 1 ounce — or enough to fill a shot glass — to fully cover their body. Rub the sunscreen thoroughly into your skin.
4. Apply sunscreen to all skin not covered by clothing. Remember your neck, face, ears, tops of your feet, and legs. For hard‐to‐reach areas like your back, ask someone to help you or use a spray sunscreen. If you have thinning hair, either apply sunscreen to your scalp or wear a wide‐brimmed hat. To protect your lips, apply a lip balm with an SPF of at least 30.
5. To remain protected when outdoors, reapply sunscreen every two hours, and immediately after swimming or sweating. People who get sunburned usually didn't reapply, used too little sunscreen, or used an expired sunscreen.

Your skin is exposed to the sun's harmful UV rays every time you go outside, even on cloudy days and in the winter. So whether you are on vacation or taking a brisk walk in your neighborhood, remember to use sunscreen.

If you feel you have developed sun-damaged skin, a dermatologist can examine your skin and make recommendations for you. No one knows your skin better than a board-certified dermatologist. To locate a dermatologist, go to Find a Dermatologist.