Sunscreen Myths Debunked: What You Need to Know to Protect Your Skin
- cuderm
- Feb 18
- 2 min read
Sunscreen is one of the most powerful tools for preventing skin cancer, premature aging, and sunburns. Yet, despite its proven benefits, many myths persist about how and when to use it. As board-certified dermatologists at Central Utah Dermatology, we’re here to clear up the confusion and set the record straight.
Myth #1: “You Only Need Sunscreen on Sunny Days”
Truth: UV rays penetrate through clouds and windows, meaning sun exposure happens even on overcast or cold days. Up to 80% of UV rays can pass through clouds, making daily sunscreen use essential—rain or shine.
Myth #2: “Darker Skin Tones Don’t Need Sunscreen”
Truth: While melanin provides some natural protection, people with darker skin can still develop sun damage, hyperpigmentation, and skin cancer. In fact, skin cancer in darker-skinned individuals is often detected later, leading to worse outcomes. Everyone, regardless of skin tone, should apply sunscreen daily.
Myth #3: “SPF 100 Is Twice as Effective as SPF 50”
Truth: SPF (Sun Protection Factor) doesn’t scale linearly. SPF 30 blocks about 97% of UVB rays, while SPF 50 blocks 98% and SPF 100 blocks 99%. The key isn’t just a higher SPF but proper application and reapplication every two hours.
Myth #4: “You Don’t Need Sunscreen If You’re Wearing Makeup with SPF”
Truth: While some makeup contains SPF, it’s rarely applied in the thick, even layer needed for full protection. A tinted moisturizer or foundation with SPF doesn’t replace a proper sunscreen layer. For best results, apply a broad-spectrum sunscreen first, then layer your makeup on top.
Myth #5: “Chemical Sunscreens Are Toxic”
Truth: The FDA and dermatologists support the safety of most chemical sunscreens. While some ingredients are under review, no studies prove that standard sunscreen ingredients harm human health. If you’re concerned, mineral sunscreens with zinc oxide or titanium dioxide are great alternatives—they provide excellent protection without chemical absorption.
Myth #6: “One Application Lasts All Day”
Truth: Sunscreen wears off due to sweat, swimming, and natural skin oils. For continuous protection, reapply every two hours and after swimming or sweating. If you’re wearing makeup, consider a powdered or spray sunscreen for easy touch-ups.
Myth #7: “A Base Tan Protects Against Sunburn”
Truth: A tan is a sign of DNA damage, not protection. Any color change in your skin after sun exposure means harm has occurred. Instead of relying on a base tan, protect your skin with sunscreen, hats, and sun-protective clothing.
Final Takeaway: Sunscreen Is Essential for Healthy Skin
Sunscreen is your best defense against premature aging, sunburns, and skin cancer. To stay protected:✅ Use broad-spectrum SPF 30+ sunscreen daily✅ Apply at least a nickel-sized amount to your face and a shot-glass amount for your body✅ Reapply every two hours or after swimming/sweating✅ Wear protective clothing and sunglasses for extra coverage
At Central Utah Dermatology, we help our patients find the best sunscreen for their skin type and lifestyle. Need a recommendation? Book an appointment today—we’re happy to help!
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