Two people can stand in front of the same mirror, point to brown patches on their cheeks, and be describing two different things. One has a scattering of small, defined spots left by summers past. The other has soft-edged, symmetrical patches across the cheekbones and upper lip that came on gradually and never quite leave. Both will say "dark spots." Only one of them has melasma — and the distinction changes how you should care for the skin.
Hyperpigmentation Is the Category, Melasma Is a Member
Hyperpigmentation simply means that an area of skin is holding more pigment (melanin) than the skin around it. It is a description, not a diagnosis. Post-blemish marks, sun spots, age spots, freckles and melasma are all forms of hyperpigmentation.
Melasma is one specific type. It appears as larger, blotchy, often symmetrical patches — typically on the cheeks, forehead, bridge of the nose, upper lip or chin — and it is strongly influenced by hormones and light. It is far more common in women, often begins during pregnancy or with hormonal contraception, and is more frequent in medium to deeper skin tones.
So the question is never "melasma or hyperpigmentation?" Melasma is hyperpigmentation. The useful question is: which kind of hyperpigmentation am I looking at?
How to Tell Them Apart
Shape and edges
Sun spots and post-blemish marks are usually small, round or oval, and clearly defined — you can see where each one starts and stops. Melasma forms larger patches with soft, irregular, map-like edges that blend into the surrounding skin.
Symmetry
Melasma is famously symmetrical: what appears on the left cheek tends to appear on the right. Sun spots and post-acne marks land wherever the sun or the blemish happened to be.
Location
Melasma favors the center of the face — cheekbones, forehead, upper lip. Sun spots gather on the most exposed areas: the tops of the cheeks, the temples, the backs of the hands. Post-blemish marks sit exactly where breakouts occur.
Timing and triggers
A post-blemish mark follows a spot. A sun spot accumulates over years and does not change much month to month. Melasma often arrives with a hormonal shift and visibly darkens after sun exposure or heat, then fades somewhat in winter, only to return with the first bright days of spring.
Color
Post-inflammatory marks can be pink, red, brown or grey depending on skin tone and depth. Sun spots are tan to brown. Melasma ranges from light brown to grey-brown, and the greyer, deeper-looking patches are the ones that respond most slowly.
If you recognize yourself in the melasma description, a dermatologist can confirm it in minutes, sometimes with a Wood's lamp that shows how deep the pigment sits. That depth is the single biggest predictor of how quickly things will improve.
Why the Distinction Changes the Treatment
Sun spots and post-blemish marks are, in a sense, finished events. The trigger has passed; what remains is pigment waiting to be gradually shed and lightened. Consistent brightening care plus daily sun protection is usually enough, and once a spot fades it tends to stay faded.
Melasma is an ongoing process. The pigment cells involved are unusually reactive and keep producing pigment in response to hormones, UV, visible light and even heat. This has three practical consequences.
First, aggressive treatment often backfires. Strong peels, harsh scrubs and high-strength acids create inflammation, and in melasma-prone skin, inflammation is itself a trigger for more pigment. Many people find their patches darker a few weeks after a treatment that was supposed to remove them. The gentle route is not the cautious option here — it is the effective one.
Second, protection matters more than any corrector. Melasma responds to visible light as well as UV, which is why it can worsen behind a window or on an overcast day. A broad-spectrum sunscreen every single morning, ideally a tinted mineral formula that also filters visible light, is the foundation. Without it, no serum can keep up.
Third, it is a maintenance concern rather than a cure. Melasma can be brought to the point where it is barely visible, but it tends to return if protection lapses. The goal is a routine you can keep up indefinitely without irritation — which rules out most of the intense options people reach for first.
What Actually Helps
For every type of hyperpigmentation, the approach rests on the same three pillars: prevent new pigment, gently reduce existing pigment, and keep the skin barrier calm so the process does not restart.
Daily broad-spectrum SPF 30 or higher, reapplied when outdoors. For melasma, look for iron oxides (found in tinted formulas) to help block visible light.
A brightening serum used consistently
Ingredients with good evidence for evening tone include tranexamic acid, niacinamide, vitamin C, alpha-arbutin, azelaic acid and botanical tyrosinase inhibitors such as garden cress sprout extract. What matters most is not the ingredient count but whether you can use the formula every day without irritation.
Hydration and barrier support
Well-hydrated skin tolerates brightening actives better and recovers faster from the small irritations that would otherwise trigger more pigment. This is why the Unifying Serum pairs its SulforaWhite® garden cress and madonna lily complex with hyaluronic acid rather than with acids — it was designed to be used morning and night, on sensitive skin, for as long as it takes.
Patience measured in weeks, not days
In Ariège Paris testing, results with Unifying Serum were evaluated after eight weeks of regular use. Post-blemish marks often improve sooner; sun spots and especially melasma take longer. Take a photo in the same light on day one and compare monthly — the change is real but too gradual to see day to day.
What to Avoid
Skipping sunscreen on cloudy days or indoors near windows. Layering several strong actives at once. Scrubbing or picking at patches. Judging results after two weeks. Treating a darker phase in summer as failure rather than as a signal to protect more carefully. And, with melasma specifically, any treatment that leaves the skin red or stinging — irritation is the one thing melasma reliably responds to, in the wrong direction.
