Written and medically reviewed by Dr. Farah Izzati. Last reviewed 2026-08-02.
The number on the bottle answers only part of the question
Patients often tell me they wear SPF 50 every day and cannot understand why their pigmentation persists. The explanation is usually not compliance. It is that SPF describes protection against ultraviolet B radiation, and melasma in Asian skin is also driven by visible light, the ordinary light you can see, which passes through most clear sunscreens almost unimpeded.
What visible light does to pigment-prone skin
Research over the past decade has shown that visible light, particularly the high-energy blue-violet portion, stimulates melanogenesis in darker skin types and produces pigmentation that is more sustained than that induced by ultraviolet A alone. Lighter skin is comparatively unaffected, which is one reason this finding took so long to reach everyday practice: much of the earlier research simply did not include the skin types we treat every day in Penang.
Why tint is not a cosmetic detail
Iron oxides, the pigments that make a sunscreen tinted, are currently the most practical way to attenuate visible light on skin. This is why I ask melasma patients to use a tinted formulation rather than a clear one, and why "invisible" sunscreens, however elegant, are the wrong tool for this specific job. The tint is the active protection, not the packaging.
The honest limits of any bottle
No sunscreen makes tropical daylight harmless. Screens and indoor lighting contribute far less than the sun, but a lunchtime walk without shade contributes a great deal. Photoprotection in Malaysia realistically means a tinted broad-spectrum sunscreen applied properly in the morning, reapplied around the middle of the day, and supported by shade, hats and sensible timing.
Where this fits in a pigmentation plan
Photoprotection is not the boring preliminary to the real treatment. It is roughly half of the treatment. Any clinic protocol, whether a regulated depigmentation programme or a gentle laser series, is competing directly against daily light exposure. Patients who accept this reach their goal faster and hold it longer, and I would rather say so plainly than let anyone believe a device alone will settle the matter.
This article is educational and does not replace a medical consultation. Suitability for any treatment is determined by a doctor at consultation.
Frequently asked questions
No. SPF measures ultraviolet B protection only and says nothing about visible light. This is the gap most patients do not know exists, and it is why someone can wear SPF 50 daily and still watch their pigmentation persist.
A tinted formulation containing iron oxides. The tint is not cosmetic: iron oxide is what blocks the visible-light wavelengths that drive pigmentation in Fitzpatrick IV and V skin. Clear sunscreens generally do not offer this protection whatever their SPF.
Beyond about SPF 30 to 50 the added ultraviolet protection is marginal, and chasing a higher number distracts from what actually matters: applying enough, and reapplying. Most people use roughly a quarter of the amount used in testing, which matters far more than the figure on the bottle.
Every two to three hours of daylight exposure, and after sweating or swimming. In this climate the exposure is daily and incidental rather than occasional, so the habit matters more than any single product choice.
It will not clear existing pigmentation, but no treatment plan works without it. Photoprotection is roughly half of any pigmentation programme, and unprotected exposure in the weeks after treatment will undo the work. We say this plainly, even when it is not what a patient hopes to hear.