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title: "Sunscreen Indoors: Do You Need It? Yes"
description: "UVA rays penetrate windows and damage skin indoors. Learn why dermatologists recommend daily SPF even inside."
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# You Stop Needing Sunscreen Indoors

MYTH 

By Jamie Reeves, Licensed Esthetician  November 15, 2023  4 min read 

## The Claim

"You do not need to wear sunscreen if you are spending the day inside."

## The Science

Standard window glass blocks most UVB rays (the ones that cause sunburn) but allows the majority of UVA rays to pass through. UVA rays are the primary driver of photoaging — responsible for wrinkles, loss of elasticity, hyperpigmentation, and increased skin cancer risk. If you sit near a window during the day, your skin is receiving significant UVA exposure.

This is not a theoretical concern. Multiple studies have documented the phenomenon of 'trucker's face' or unilateral dermatoheliosis, where one side of the face shows dramatically more aging than the other due to years of UVA exposure through a car window. The same principle applies to anyone who works near windows or in naturally lit spaces.

The solution does not require thick, heavy sunscreen. Modern lightweight, cosmetically elegant SPF products — including tinted moisturizers with SPF, mineral sunscreens, and SPF-containing primers — make indoor sun protection easy and comfortable. For those concerned about blue light from screens, mineral sunscreens containing iron oxides provide additional protection.

### Key Takeaway

UVA rays penetrate glass windows and cause cumulative skin damage and premature aging even when you are indoors sitting near a window.

## Related Articles

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![What Happens to Your Skin If You Never Wear Sunscreen](https://images.unsplash.com/photo-1532938911079-1b06ac7ceec7?w=800&h=400&fit=crop&q=80&fm=webp)

Treatments 

### What Happens to Your Skin If You Never Wear Sunscreen

Sunscreen isn't a skincare nice-to-have. It's the single most effective anti-aging and cancer-prevention tool available. Here's the science of what happens without it.

Jamie Reeves · 9 min read 





](/articles/treatments/what-happens-without-sunscreen)[

![Hyperpigmentation: The Difference Between PIE and PIH](https://images.unsplash.com/photo-1522337360788-8b13dee7a37e?w=800&h=400&fit=crop&q=80&fm=webp)

Skin Concerns 

### Hyperpigmentation: The Difference Between PIE and PIH

That dark spot left behind after a breakout — is it PIE or PIH? The distinction matters more than you think, because the treatments are completely different.

Jamie Reeves · 8 min read 





](/articles/skin-concerns/hyperpigmentation-pie-vs-pih)

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