Sunscreen Is the Whole Game

I want to be careful here because I know how this chapter might come across.

Patients tell me all the time that they "know" sunscreen is important. They nod when I bring it up. They say they wear it "sometimes." They've heard the lecture before and they're hoping we can move on to the more interesting stuff, like the new laser they read about or whether they should try filler in their cheeks.

So here's what I want you to understand before we go any further.

I can do every procedure in this book on you. Botox. Filler. Threads. Lasers. Peels. Microneedling. All of it. I can spend ten thousand dollars of your money over five years making your skin look great. And if you walk out of my office and don't put on sunscreen, all of it is partially undone every time you drive to work with the sun on your face. All of it.

About eighty percent of what we call skin aging is photoaging. That's not a number I'm making up. It's been studied and replicated across decades of dermatology research. Eighty percent. Wrinkles, sunspots, broken capillaries, sagging, leathery texture, loss of elasticity, that overall tired-looking quality. Most of it is sun. Some of it is genetics, some is lifestyle, but the biggest controllable factor is UV exposure.

This means two things. One, if you're not protecting your skin from the sun, you're paying for procedures that fix damage you keep making. Two, if you do protect your skin from the sun, consistently, starting today, you'll prevent the vast majority of what would have aged you over the next twenty years. Sunscreen is the single highest-impact thing you can do for your skin. It costs less than a good dinner per bottle. And most people are not doing it right.

Let's fix that.

What Sunscreen Actually Does

UV radiation from the sun comes in three flavors. UVA, UVB, and UVC. UVC mostly gets absorbed by the atmosphere and doesn't reach you. UVB causes sunburns and contributes heavily to skin cancer. UVA penetrates deeper into the skin and is the main driver of photoaging. Wrinkles, pigment changes, loss of collagen.

The word "broad spectrum" on a sunscreen means it protects against both UVA and UVB. If a sunscreen doesn't say broad spectrum, it probably isn't, and it's not adequate. Always check for that wording.

There are two main categories of sunscreen, and you'll hear strong opinions about both.

Mineral (physical) sunscreens use zinc oxide, titanium dioxide, or both. They sit on top of the skin and reflect UV away. They tend to be gentler on sensitive skin. They start working immediately on application. They can leave a white cast, especially on darker skin tones, though newer formulations have improved this significantly.

Chemical sunscreens use organic compounds like avobenzone, octinoxate, octisalate, and others. They absorb UV and convert it to heat that's released from the skin. They tend to be more cosmetically elegant, with no white cast and lighter textures. They need about fifteen to twenty minutes to start working after application. Some chemical filters have come under scrutiny for hormone disruption and environmental impact (particularly to coral reefs), though the evidence is more complicated than the headlines suggest.

There's a movement online that mineral is "clean" and chemical is "toxic." I'd push back on this. The FDA-approved chemical filters have decades of safety data. The newer-generation chemical filters used in European and Asian sunscreens are even better in many ways. The mineral-versus-chemical debate is mostly marketing.

What actually matters is whether you'll wear it every day. The best sunscreen is the one you'll actually use. If you hate the white cast of mineral sunscreens and skip them, mineral is not the right answer for you. If chemical filters break you out, mineral is your friend. Find one you like. Wear it.

The SPF Number Game