Before a brightening serum — the saying that sunscreen accounts for 80% of dark spot care
Brightening ingredients help make existing tone concerns look more even, while preventing new ones is mostly the job of sun protection. That’s why the order matters.
Dark spot care priorities
- Sunscreen every day (even on cloudy days and indoors)
- Reapply every 2–3 hours (outdoors)
- Physical protection with a hat or parasol
- Then one brightening functional serum
- Use it consistently for 6–8 weeks before judging
Should you wear sunscreen when working by a window?
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That’s generally true. In dark spot care, sunscreen is less a step for ‘erasing existing marks’ and more a basic step to reduce the chances of UV making discoloration darker or causing new marks. It’s also worth being careful how you describe brightening functional ingredients. They generally help make the skin tone look more even; they don’t guarantee that existing pigmentation will definitely disappear.
The order is simple: in the morning, apply enough broad-spectrum sunscreen with SPF 30 or higher, if possible, after moisturizer, and reapply if you’ll be outdoors for a long time or exposed to sweat or water. It’s also a good idea to use a hat or stay in the shade. In the evening, introduce ingredients such as niacinamide or a vitamin C derivative one at a time, and if irritation occurs, it’s better to reduce the frequency first. Finding a formula that’s easy to apply every day may ultimately be the most practical ‘key ingredient’ of all.