Melasma: what causes it and what you can change
Melasma rarely has one cause. This page unpacks UV exposure, hormonal changes and heat and visible light and shows how to test which one is yours without overhauling your routine.
The main drivers behind melasma
UV exposure is one of the first drivers to check. When it is involved, people often notice symmetrical patches on cheeks, so ask whether this factor changed shortly before the pattern started.
Consider hormonal changes. It is linked with forehead or upper lip darkness, which makes a dated note of when you first saw that sign genuinely useful.
Everyday triggers to log this week
Beyond the headline causes, small habits add up: hot yoga, sun, heat from cooking, and hormonal changes. Keep a note on your phone for seven days — product used, hours slept, sweat or heat exposure and stress level.
Then photograph or scan the same zones each evening: cheeks, forehead, upper lip and chin. Patterns tend to jump out when the data is in one place.
Run a two-week experiment
Week one: change nothing and record baseline. Week two: switch to a tinted mineral SPF 50 and reapply every two hours outdoors. Because only one variable moved, any change in symmetrical patches on cheeks can be linked to it.
A common belief is that peels or lasers alone solve it; in practice heat and visible light can bring it back, so tinted mineral SPF and shade are as important as actives, so resist the urge to escalate if week two looks quiet.
Hold the line on what you avoid
While you test, avoid waxing affected areas and high-heat facials without protection. These are the most common ways people accidentally reinforce the cause they are trying to remove.
If the pattern does not respond after a full cycle (three months before shifts are visible, and maintenance continues year-round), involve a professional, particularly for any new patches that need an exact diagnosis and tailored treatment.
A zone-by-zone check
Whole-face impressions hide progress. Check each of these zones on its own, in the same light, once a week.
A quick self-audit
Answer honestly before adding or swapping a product. Most plateaus are explained by one of these.
Frequently asked questions
Can UV exposure alone cause melasma?
It can be a major contributor, but melasma usually has several drivers at once. Fixing UV exposure first is sensible because it is cheap to test.
How do I know which cause applies to me?
Change one variable for two weeks and keep a log. If symmetrical patches on cheeks eases when only UV exposure changes, you have a lead.
Is melasma caused by a dirty face?
Rarely. The idea that peels or lasers alone solve it is a persistent myth; heat and visible light can bring it back, so tinted mineral SPF and shade are as important as actives.