5 Myths vs. SPF: The Truth About Sunscreen Safety

When it comes to sun protection, misinformation can spread faster than a summer sunburn. From viral social media claims to outdated advice, sunscreen myths can put your skin—and your health—at risk.

At Seacoast Dermatology, our board-certified dermatologists know that sun safety is non-negotiable. With skin cancer rates on the rise and premature aging a constant threat, sunscreen remains one of the most effective tools in your skincare arsenal. Let’s separate fact from fiction so you can enjoy your summer safely.

Myth #1: “Sunscreen causes cancer”

The Truth: This is one of the most dangerous—and false—claims circulating online. Decades of research show that regular sunscreen use reduces the risk of skin cancers, including melanoma, basal cell carcinoma, and squamous cell carcinoma.

If you’re concerned about certain ingredients, opt for mineral sunscreens with zinc oxide or titanium dioxide. These are FDA-approved, reef-safe, and recognized as effective for all skin types.

Myth #2: “You only need sunscreen on sunny days”

The Truth: UV rays don’t take a vacation when it’s cloudy. Up to 80% of UV rays penetrate clouds, meaning your skin is still at risk for sun damage, even in overcast or cool weather.

Pro tip from Seacoast Dermatology: Apply a broad-spectrum SPF 30 or higher every morning, year-round—even if you’re staying indoors near windows.

Myth #3: “Makeup with SPF is enough

The Truth: Makeup products with SPF provide some protection, but not nearly enough on their own. To match the labeled SPF, you’d need to apply seven times more foundation than most people actually use.

Dermatologist’s Advice: Apply a dedicated sunscreen first, then layer your makeup on top. This ensures complete and even coverage.

Myth #4: “Darker skin doesn’t need sunscreen

The Truth: While darker skin tones have more natural melanin, they are not immune to UV damage. Sun exposure can still cause hyperpigmentation, sunburn, and skin cancer. Unfortunately, these cancers are often diagnosed later and may be more aggressive.

Bottom line: Everyone, regardless of skin tone, should wear sunscreen daily.

Myth #5: “Chemical sunscreens are toxic”

The Truth: While the FDA is gathering more data on certain chemical filters, this does not mean they are unsafe. Both mineral and chemical sunscreens are considered effective and safe when used correctly.

Our recommendation: Choose a sunscreen you enjoy using—because the best sunscreen is the one you’ll apply consistently.

How to Apply Sunscreen the Right Way

• Use 1 oz (a shot glass) for your entire body.
• Apply 15 minutes before sun exposure.
• Reapply every 2 hours or immediately after swimming/sweating.
• Don’t forget often-missed spots: ears, scalp, lips, hands, and feet.

Why Trust Seacoast Dermatology for Sun Safety?

Our team has decades of experience diagnosing and treating sun-related skin conditions. We combine the latest medical research with personalized care to help you protect and preserve your skin for a lifetime.

When you choose Seacoast Dermatology, you’re choosing a practice that prioritizes education, prevention, and early detection—because healthy skin is always in season.