Your Ultimate Guide to Sunscreen: What Dermatologists Want You to Know This Summer

May marks the beginning of sunshine season—and also Skin Cancer Awareness Month, making it the perfect time to talk about your skin’s first line of defense: sunscreen. With Melanoma Monday on May 6 and National Sunscreen Day on May 27, there’s no better moment to brush up on what really matters when it comes to sun protection.

Whether you’re a sunscreen rookie or a daily devotee, here’s everything you need to know—straight from the team at Central Missouri Dermatology.

What Does SPF Actually Mean?

SPF stands for Sun Protection Factor, and it measures how well a sunscreen protects against UVB rays—the kind that cause sunburn and contribute to skin cancer.

SPF 30 blocks about 97% of UVB rays
SPF 50 blocks about 98%
No sunscreen blocks 100%, so reapplying is key!

For most people, SPF 30 or higher is the sweet spot. It’s also important to choose a broad-spectrum formula, which protects against both UVA (aging) and UVB (burning) rays.

Mineral vs. Chemical Sunscreens: What’s the Difference?

Choosing between mineral and chemical sunscreen comes down to how they work and how your skin reacts.

Mineral (Physical) Sunscreens

• Use ingredients like zinc oxide or titanium dioxide
• Sit on top of the skin and reflect UV rays
• Great for sensitive skin, babies, or anyone who prefers a more natural option
• May leave a white cast (though many formulas have improved)

Chemical Sunscreens

• Absorb into the skin and convert UV rays into heat
• Lightweight and often invisible on the skin
• Best for sports, swimming, or under makeup
• May irritate sensitive skin or eyes

Still not sure which is right for you? Ask your dermatologist—we’re happy to help!

Reapplication Tips: Keep the Protection Going

Applying sunscreen once in the morning isn’t enough, especially if you’re sweating, swimming, or just spending a long day outdoors.

General Rule:

Reapply every 2 hours—or immediately after swimming or sweating.

With Makeup?

• Use a powder sunscreen or setting spray with SPF to reapply without smudging your makeup.
• Don’t forget areas like your neck, ears, and the back of your hands!

During Sports?

• Look for water-resistant formulas (40 or 80 minutes)
• Keep a stick or spray in your bag for quick reapplication on the go

Dermatologist-Recommended Sunscreens by Skin Type

There’s no one-size-fits-all sunscreen. Here are a few favorites we often recommend based on skin type:

For Oily or Acne-Prone Skin

• EltaMD UV Clear SPF 46
• La Roche-Posay Anthelios Clear Skin Dry Touch SPF 60

For Dry or Sensitive Skin

• CeraVe Hydrating Mineral Sunscreen SPF 30/50
• Aveeno Positively Mineral Sensitive Skin SPF 50

For Active Lifestyles

• Neutrogena Sport Face Oil-Free Lotion SPF 70
• Blue Lizard Active Mineral-Based SPF 50+

Myth-Busting: Sunscreen Edition

Let’s clear up a few common misconceptions:

“I don’t need sunscreen on cloudy days.”

Up to 80% of UV rays can pass through clouds. Apply sunscreen no matter the weather.

“I don’t burn, so I don’t need sunscreen.”

All skin types can experience UV damage—even if you tan easily. Sun protection is for everyone.

“I’m only outside for a few minutes—it’s fine.”

UV exposure adds up over time. Daily sunscreen helps protect against long-term skin damage and premature aging.

Bonus: Save 20% on Sunscreen All May Long!

In honor of Skin Cancer Awareness Month, we’re offering 20% off all sunscreen products in our office during May. Stock up on dermatologist-approved favorites and stay protected all summer long!

Let’s Protect What Matters

Sunscreen is a small step that makes a big difference in your skin’s long-term health. Whether you’re headed to the lake, out for a walk, or just driving to work—make it a habit this season and beyond.

Need help choosing the right sunscreen or scheduling a skin check? Give us a call or stop by Central Missouri Dermatology—we’re here to keep your skin safe and glowing.