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Direct Answer
SPF only measures protection against UVB, the wavelength that causes sunburn. UVA, the wavelength that actually drives most pigmentation, requires a separate kind of protection, labeled “broad spectrum” or shown as a PA rating. A sunscreen with a high SPF number but no broad-spectrum label can genuinely leave pigmentation-causing rays almost entirely unaddressed, which is why diligent daily sunscreen use doesn’t always stop new marks from forming.
It’s a genuinely frustrating experience: you wear sunscreen every day, and pigmentation still shows up. The product isn’t necessarily failing. It might just be protecting against the wrong half of the problem.
Two different rays, two different jobs
UVB rays are high-energy and mostly affect the outermost layer of skin, which is why they’re responsible for sunburn. UVA rays have a longer wavelength, penetrate deeper into skin’s dermal layers, and are responsible for the majority of pigmentation and premature aging specifically. SPF, the number on every sunscreen bottle, measures UVB protection only. It says nothing on its own about how well a product handles UVA.
Why this matters even when you’re not visibly in the sun
UVA rays pass through glass and clouds. A commute in a car, sitting near a window, an overcast day, all still deliver UVA exposure even without the direct sun contact that would trigger obvious sunburn. This is part of why pigmentation can keep building even in someone who avoids obvious sun exposure and never burns.
What to actually check for
“Broad spectrum” on the label means a product has been tested to protect against both UVA and UVB. Some regions also use a PA rating specifically for UVA protection, with PA++++ indicating the strongest available level. SPF 50 alongside broad spectrum or a high PA rating is what’s actually needed to address pigmentation specifically, not SPF alone. Research has also found that broad-spectrum protection, covering UVA, UVB, and visible light, plays a genuine supporting role in stabilizing and improving existing pigmentation, not just preventing new marks. (For the underlying research, see this peer-reviewed review on sunscreen’s role in melasma and pigmentation.)
The habit worth building alongside the right product
Even genuinely broad-spectrum sunscreen needs reapplying roughly every two hours to keep working, and a single morning application rarely covers a full day. In Malaysia’s UV intensity, treating sunscreen as an all-day habit rather than a one-time morning step is what actually determines whether pigmentation keeps forming.
Not sure if your current sunscreen is actually doing the job?
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