Do you really need sunscreen every day?

If you only ever adopt one skincare habit, make it this one. Daily sunscreen is the least glamorous and most effective thing you can do for your skin — and it's also the step most people quietly skip, usually because of a few understandable myths. So: do you really need it every day? For almost everyone, yes. Here's why, without the scare tactics.

UVA, UVB, and why "it's not sunny" doesn't get you off the hook

Sunlight reaches your skin as two kinds of ultraviolet. UVB is the one that burns you — strong in summer and at midday, weaker in winter. UVA is the one that quietly ages skin: it sits at fairly steady levels all year round, on grey days as much as bright ones, and it passes through cloud and window glass. UVB makes the case for summer sunscreen obvious; UVA makes the case for daily, year-round sunscreen, because the damage it does is happening even when you don't feel a thing.

What the sun actually does over time

Beyond burning, accumulated UV exposure is the single biggest driver of premature skin ageing — far more than the natural passage of time. It breaks down collagen and elastin (the fibres that keep skin firm and springy), which shows up as fine lines, sagging and a leathery texture down the line. It drives uneven pigment and dark spots, and makes existing marks — including post-acne marks — darker and slower to fade. And, most importantly, it's the main risk factor for skin cancer. Sunscreen is the closest thing to an anti-ageing product that genuinely earns the label.

"But I'm inside all day"

A reasonable point, and the honest answer is: it depends. If you're genuinely away from windows all day, your exposure is low. But UVA comes through glass, so a desk by a window, a sunny commute, or daylight around the home all add up — and the dose is cumulative over years. For most people the simplest, safest habit is to wear it daily so it's automatic, rather than judging each day's exposure. If you truly spend all day in a windowless room, you can be more relaxed about it.

How much, and how often

This is where sunscreen usually falls down — not the product, but the amount. Most people apply far too little to get the protection on the label. For the face and neck, roughly two finger-lengths of product is the rule of thumb. Apply it as the last step of your morning routine, before make-up. And reapply through the day if you're outdoors for long stretches, sweating or swimming — roughly every couple of hours in those situations. On a normal indoor day, a solid morning application does most of the work.

Choosing one you'll actually wear

The best sunscreen is the one you'll happily put on every single day, so texture matters as much as the label. Look for "broad spectrum" (it protects against both UVA and UVB) and SPF 30 or higher. Beyond that, it's about feel: lightweight fluids, tinted formulas, and ones that sit well under make-up have made daily wear far easier than it used to be. If you've hated sunscreen in the past, it's worth knowing modern formulas are a world away from the thick, white, greasy ones — trying a few textures is the trick.

A note on darker skin tones

A common myth is that deeper skin tones don't need sunscreen. More melanin does offer some natural protection, but it's far from complete — and UVA-driven ageing and, especially, hyperpigmentation and uneven tone remain very real concerns. If dark spots or post-acne marks are something you deal with, daily sunscreen is one of the most effective steps you can take, because sun is what keeps driving that pigment back.

When to see a professional

Sunscreen is prevention, not diagnosis. If you notice a mole or spot that's new, changing, growing, bleeding, or simply looks different from the others, get it checked by a doctor — that's outside what any skincare routine can address, and worth acting on promptly.