Wearing sunscreen is essential for protecting your skin from harmful ultraviolet (UV) rays that cause sunburn, premature aging, and increase the risk of skin cancer. Dermatologist Dr. Alexander Witkowski, a skin cancer expert, explains how to use sunscreen properly to get the best protection.
When to Apply and How Much
Apply sunscreen 15 to 30 minutes before going outside to allow it to bond with your skin. If you use a mineral sunscreen, you can head out immediately after application. Use at least half a teaspoon (two finger lengths) for your face and about one ounce (a shot glass full) for your entire body. Make sure to cover often-missed spots like your ears, neck, hairline, and hands.
How Often to Reapply
Reapply sunscreen every two hours when you are outdoors. Activities like swimming, sweating, or towel drying can remove sunscreen, so reapply immediately afterward. On cloudy days or when indoors near windows, UV rays can still damage your skin, so daily use of sunscreen is recommended. For indoor exposure without windows, reapplying every four to six hours is sufficient.
Choosing the Right Sunscreen
For everyday activities like commuting or walking, use a broad-spectrum sunscreen with SPF 30, which blocks about 97% of UV rays. For sports or extended outdoor time, choose water- and sweat-resistant sunscreens with SPF 50 or higher. For intense sun exposure, such as beach days or high-altitude hiking, opt for SPF 60 or above.
Additional Tips
- Apply sunscreen as the last step in your skincare routine.
- Use gentle upward strokes or patting motions to apply sunscreen evenly.
- Carry different sunscreens for daily use and outdoor activities.
- Don’t skip sunscreen on cloudy days or during short sun exposure.
Dr. Witkowski sums it up: “The worst mistake is skipping sunscreen altogether.” Proper application and regular reapplication are key to keeping your skin healthy and protected.
