Why You Need Sunscreen Every Day

Why You Need Sunscreen Every Day – Yes, Even Indoors

Many people still believe that sunscreen is only necessary for days spent lounging at the beach or walking in direct sunlight. If it looks cloudy outside or they’re spending the day indoors, they assume there’s no need to apply any at all. This common mindset leads to one of the biggest skincare oversights: neglecting daily sun protection, especially when there appears to be little to no sunshine.

The truth is, sunscreen should be part of everyone’s everyday routine, just like brushing your teeth or washing your face. Harmful ultraviolet (UV) rays can reach you even when you’re inside your home, in the office, or sitting by a window. You might not see the sun beaming through, but the damage it can cause to your skin doesn’t take a break.

UV rays don’t take days off

There are two main types of UV rays you need to be concerned about: UVA and UVB. UVB rays are mostly responsible for sunburn and are strongest during midday, while UVA rays penetrate deeper into the skin and are present all year round, even during cloudy weather and through windows¹. This means that just sitting by a window while working or driving can still expose your skin to damage.

Indoor lighting, particularly fluorescent and halogen bulbs, and the blue light emitted from digital devices can also contribute to premature skin ageing. While the effects might not be as severe as direct UV exposure, studies suggest that prolonged screen time may contribute to hyperpigmentation and collagen breakdown². Over time, this can lead to dark spots, uneven skin tone, and fine lines.

Even indoor workers are at risk

Just because you spend most of your time inside doesn’t mean you’re off the hook – even indoor workers are at risk of skin cancer. The sneaky part about UV damage is that it builds up gradually and silently, and by the time you notice signs, much of the harm has already been done.

“But I don’t see the sun!”

It’s easy to think you’re safe when the sky is overcast or you’re tucked inside an air-conditioned room all day. But UVA rays are persistent and can penetrate through windows, meaning you’re still exposed during your daily routines. Whether you’re cooking near a kitchen window, driving to work, or having a lazy weekend indoors, those rays are still reaching you.

And remember, UV exposure isn’t limited to natural light. The blue light from your laptop, phone, and TV also plays a role in skin damage. Although its effects aren’t exactly the same as UV rays, it can still affect your skin barrier and cause oxidative stress, which speeds up skin ageing³. Think of it as silent skin stress that adds up over time.

Sunscreen as your daily armour

Applying sunscreen each morning is like putting on a protective shield that protects your skin’s health and appearance in the long term. Using broad-spectrum sunscreen with SPF 50 or higher protects against both UVA and UVB rays. That means you’re defending your skin from photoageing, wrinkles, pigmentation, and, in the worst-case scenario, skin cancer.

And no, sunscreen isn’t just for beach holidays or hikes in the sun. It’s your everyday must-have, even when you’re just heading to the office, popping out for coffee, or working from home in your PJs.

For those with specific skin concerns, it’s always best to seek personalised advice. Consulting a dermatologist in Singapore can help you choose the right sunscreen formulation for your skin type, whether it’s oily, acne-prone, sensitive, or mature.

Don’t forget these easy tips

Sunscreen works best when used properly. Here are a few reminders to make sure you’re getting the most out of it:

Apply enough: Most adults need about half a teaspoon for the face and neck alone. Skimping on product reduces its effectiveness.
Reapply: Ideally, sunscreen should be reapplied every 2 to 3 hours, especially if you’re sweating or wiping your face. Even if you’re indoors, it’s good to refresh it after lunch or before heading out.
Don’t forget these spots: Ears, neck, eyelids, lips, the top of the scalp and the back of your hands are often forgotten but equally exposed.

Layer properly: If you wear moisturiser or makeup, sunscreen should be your final skincare step before applying any cosmetic products.

Pair it with sun-smart habits: Wearing a wide-brimmed hat, UV-blocking sunglasses, and avoiding peak sun hours (10am to 4pm) can further boost your defence.

Choosing the right sunscreen

The variety of sunscreens on the market can be overwhelming, but here’s what to look for:

Broad-spectrum: This ensures coverage against both UVA and UVB rays.
SPF 40 or higher: SPF 15 blocks about 93% of UVB rays and SPF 30 offers around 97%. If you’re spending time outdoors, opt for at least SPF 40 to 50.
Water-resistant: Ideal for humid environments or days when you know you’ll sweat a bit more.
Non-comedogenic: If you’re prone to acne or clogged pores, this is your go-to label.
Mineral vs chemical: Mineral (or physical) sunscreens with zinc oxide or titanium dioxide are great for sensitive skin, while chemical sunscreens often feel lighter and work well under makeup.

If you’re unsure which type suits you best, getting a recommendation from a dermatologist ensures you’re using one tailored to your skin’s needs and lifestyle.

Conclusion

Sunscreen isn’t a “nice-to-have” but a daily essential. Whether it’s sunny, cloudy, or you’re staying home, your skin is still exposed to harmful rays that can speed up ageing and lead to long-term damage. Incorporating sunscreen into your daily routine is one of the simplest and most effective steps you can take for your skin’s health and beauty.

If you’re looking for expert guidance, Angeline Yong Dermatology offers cosmetic, surgical, and medical dermatology treatments in Singapore. Whether you’re choosing the right sunscreen or managing long-term skin concerns, our team is ready to help you put your best face forward every day.

References

Diffey B. L. (2002). Sources and measurement of ultraviolet radiation. Methods (San Diego, Calif.), 28(1), 4–13. https://doi.org/10.1016/s1046-2023(02)00204-9

Kumari, J., Das, K., Babaei, M., Rokni, G. R., & Goldust, M. (2023). The impact of blue light and digital screens on the skin. Journal of cosmetic dermatology, 22(4), 1185–1190. https://doi.org/10.1111/jocd.15576

Tuchinda, C., Srivannaboon, S., & Lim, H. W. (2006). Photoprotection by window glass, automobile glass, and sunglasses. Journal of the American Academy of Dermatology, 54(5), 845–854. https://doi.org/10.1016/j.jaad.2005.11.1082

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Why You Need Sunscreen Every Day – Yes, Even Indoors