Sunscreen is one of the most powerful tools against skin aging, sunburn, and even skin cancer. But thanks to misinformation, a lot of people are using it wrong—or not at all. Let’s clear up the biggest sunscreen myths so you can actually protect from running your skin.

Myth #1: Darker Skin Doesn’t Need Sunscreen

False. Melanin provides some natural protection, but it’s not enough to prevent UV damage. Darker skin tones can still get hyperpigmentation, sunburns, and skin cancer. Sunscreen is for everyone, no matter your skin color.

Myth #2: SPF 100 is Way Better Than SPF 30

Not really. SPF 30 blocks 97% of UVB rays, while SPF 50 blocks 98%. SPF 100? 99%. The difference is tiny. What really matters is how often you reapply, not how high the number is.

Myth #3: If Your Makeup Has SPF, You’re Covered
A woman in a white robe applying makeup with a brush in front of a well-lit vanity mirror. which is not one of the sunscreen myths.

Nope. The SPF in foundation or moisturizer is usually not enough on its own. You’d have to apply an unrealistic amount of makeup to get the protection on the label. A dedicated sunscreen under your makeup is the way to go.

Myth #4: Sunscreen Isn’t Needed Indoors

Wrong. UV rays can pass through windows, especially UVA rays that cause wrinkles and aging. If you sit near a window or scroll on your phone all day, blue light can also contribute to hyperpigmentation. SPF isn’t just for outside.

Myth #5: Waterproof Sunscreen Lasts All Day

False. No sunscreen is truly waterproof—the FDA even banned that term. They’re water-resistant, but only for 40 to 80 minutes. If you’re sweating or swimming, reapply every 2 hours to stay protected.

Myth #6: You Only Need Sunscreen When It’s Sunny

Big mistake. Up to 80% of UV rays still reach your skin on cloudy or cold days. Just because you don’t feel the sun doesn’t mean your skin isn’t getting hit with damage.

Myth #7: Chemical Sunscreens Are Toxic

Not exactly. There’s a lot of fear-mongering around chemical sunscreens, but they’re FDA-approved and considered safe. However, if you have sensitive skin, mineral sunscreens (zinc oxide, titanium dioxide) might be a better option.

Myth #8: One Application in the Morning is Enough

Absolutely not. Sunscreen wears off due to sweat, oil, rubbing, and exposure. If you’re out and about, reapply every 2 hours—or more if you’re swimming.

Bottom Line

Sunscreen is your best defense against aging and skin cancer, but only if you use it right. Stick with SPF 30+ daily, reapply every 2 hours, and don’t fall for these sunscreen myths. Your skin will thank you! If this helped, take a look at this skincare blog for more easy, effective tips you can actually use.