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Direct Answer
Sun spots are small, well-defined, and caused entirely by cumulative UV exposure, with no hormonal component at all. Melasma is different: larger, blotchy, symmetrical patches with blended, undefined edges, driven by a real interplay of hormones and UV together, not UV alone. That hormonal piece is why melasma often needs a genuinely different approach, and why treating it exactly like a sun spot tends to disappoint.
Both show up as unwanted darkening, both get triggered by sun, and both get lumped under “pigmentation” in casual conversation. Underneath, they’re different enough that the wrong approach genuinely doesn’t work.
What actually sets melasma apart
Melasma is strongly influenced by hormonal shifts, pregnancy, hormonal birth control, hormone therapy, alongside sun exposure, heat, and inflammation as additional triggers. It’s sometimes called the “mask of pregnancy” for exactly this reason, though it affects people outside pregnancy too, including men. It shows up as symmetrical, blotchy patches, typically on the face, with soft, blended borders rather than a clearly defined edge.
Why sun spots read differently
Solar lentigines have no hormonal component at all. They’re caused purely by cumulative UV exposure over years, which is why they can appear anywhere sun-exposed, not just the face, hands, shoulders, chest. They’re small, well-defined, with clear borders, and consistent in color, genuinely different in appearance from melasma’s soft, spreading patches once you know to look for the distinction.
Why melasma is genuinely harder to treat
Treating the visible pigment while ignoring an ongoing hormonal trigger, pregnancy or hormonal contraceptive use, for example, tends to produce disappointing, short-lived results. Melasma is more prone to recurrence than sun spots specifically because the trigger isn’t purely external the way UV exposure is. This is a real reason melasma is best managed with a dermatologist’s guidance rather than the trial-and-error approach that often works fine for a straightforward sun spot. (For the full clinical comparison, see this dermatology breakdown of melasma versus sun spots versus age spots.)
The one thing both genuinely share
Sun protection is non-negotiable for both, since UV is either the sole driver or a major contributing one either way. Where they diverge is what else needs addressing alongside it: consistent topical care and time for sun spots, versus identifying and managing the hormonal piece for melasma, which sun protection alone won’t resolve.
Not sure which one you’re actually dealing with?
Book a 60-minute consultation with Ken — RM30, a real diagnosis, no pitch.
