Melasma, freckles and age spots are all forms of hyperpigmentation (dark spots), but they are fundamentally different — and the fastest way to tell them apart is by four clues: shape, location, age of onset and how they change with the seasons. Melasma appears as diffuse, symmetric patches on the cheeks, forehead and upper lip, driven by hormones and UV, chronic and prone to relapse; freckles are small, light-brown macules with a genetic basis that appear in childhood and fade in winter; solar lentigines (age spots / sun spots) are larger, well-defined spots caused by cumulative sun damage that do not fade seasonally; and post-inflammatory hyperpigmentation (PIH) is a dark mark that appears exactly where acne or an injury once was. Identifying the correct type is a mandatory first step, because each one needs a different treatment approach — and treating the wrong one (especially aggressive laser for melasma) can make things worse, not better.
This article is a practical guide to distinguishing the pigmentation types most often confused on Vietnamese skin: melasma (epidermal/superficial, dermal/deep, and mixed), freckles, solar lentigines and post-acne marks. You will get a detailed comparison table, an at-home identification guide, and a clear explanation of why "diagnose first, treat second" matters so much. Content is compiled from the American Academy of Dermatology (AAD), DermNet NZ, StatPearls (NCBI) and review articles on the US National Library of Medicine (PMC), combined with real clinical experience at Eternal Beauty Center — a skincare centre in Go Vap, Ho Chi Minh City. To go deeper on melasma alone, read our overview: Melasma: causes and treatment.
Quick look: four "dark spots" people mix up
Not every dark spot on the face is melasma. On Vietnamese skin, four pigmentation conditions are commonly lumped together as "melasma" or "freckles" when they are really four different problems: melasma, freckles (ephelides), age spots / solar lentigines, and post-inflammatory hyperpigmentation (PIH). They differ in cause, in how deep the pigment sits in the skin, and — most importantly — in how they respond to treatment.
In simple terms, every dark spot is the result of excess melanin produced and deposited in the skin. But where the melanin sits (superficial epidermis vs deeper dermis), what triggers it (hormones, genetics, sun, or inflammation) and how it is distributed (scattered spots vs diffuse patches) determine which type it is. That is exactly why an over-the-counter "anti-melasma" product can do nothing for one person yet work for another — because they actually have two different conditions.
Three questions point you in the right direction from the start:
Is it scattered spots or a diffuse patch? Small separate spots suggest freckles/age spots; large symmetric patches suggest melasma.
When did it appear, and does it change with the seasons? Present since childhood and fading in winter → freckles; appearing in middle age and staying put → age spots.
Does it sit exactly where acne or an injury once was? If it tracks an old blemish → post-inflammatory hyperpigmentation.
The next four sections describe each type, followed by a summary comparison table.
What is melasma — and its 3 depth types
Melasma is an acquired form of hyperpigmentation that shows up as brown to grey-brown patches distributed symmetrically on both sides of the face — most often on the cheeks, forehead, bridge of the nose, upper lip and chin. Per DermNet NZ and the AAD, melasma is driven mainly by two combined factors: hormones (estrogen/progesterone) and ultraviolet (UV) light, which is why it is especially common in women of reproductive age, during pregnancy (the "mask of pregnancy" — chloasma) or when using hormonal medication. Heat and visible light (including blue light from screens) can also trigger it.
Two key diagnostic features of melasma: symmetry (it appears almost identically on both cheeks) and ill-defined, diffuse patch-like borders — completely different from the scattered, sharply bordered spots of freckles or age spots. Melasma also typically spares the area around the eyes. One thing to accept up front: melasma is a chronic, relapsing condition — meaning it can be controlled, lightened and maintained, but there is no way to "cure it once and for all permanently." Any promise of "100% melasma removal" should make you cautious.
The factor that decides treatment is the depth of the pigment. The literature divides melasma into three types:
Epidermal melasma (superficial / patch melasma). Pigment sits mainly in the epidermis, is a clear brown, with relatively defined borders. Under a Wood's lamp, the affected area appears darker and more enhanced — a sign the pigment is superficial. This type responds best to topical actives and peels.
Dermal melasma (deep melasma). Pigment sits deep in the dermis, appears grey-brown or blue-grey, with blurred borders. Under a Wood's lamp it is less enhanced because the melanin is deep. This is the hardest type to treat, responds slowly, and relapses easily.
Mixed melasma. A combination of both — the superficial part responds faster, the deep part slowly. This is the most common type in clinical practice.
So the question "is it superficial or deep melasma" is not semantics — it completely changes the expectations and the protocol. Classifying depth requires a dermatologist's assessment using examination, a Wood's lamp or a dermatoscope; it cannot be guessed reliably from a photo.
What are freckles (ephelides)
Freckles (ephelides) are small, flat, light-brown to brown macules, 1–3mm in size, usually clustered on sun-exposed areas such as the cheeks, bridge of the nose, shoulders and backs of the hands. Per DermNet NZ and StatPearls, freckles have a clear genetic basis (linked to the MC1R gene), are common in fair-skinned people with blond/red hair, and typically appear in early childhood (from about age 2–3), darkening through the teenage years.
The most distinctive clue for freckles is seasonal change: they darken in summer with more sun and fade noticeably in winter or when sun is carefully avoided. This is a major difference from age spots (which don't fade seasonally) and melasma (which doesn't fluctuate this way). Fundamentally, freckles arise because pigment cells (melanocytes) produce more melanin when exposed to UV, not because the number of pigment cells increases.
Freckles are benign and, for many people, a charming feature. If you want to fade them, targeted pigment methods (such as selective laser, light-based therapy or brightening actives) can be effective — but sun protection remains the foundation, because without it freckles return every summer. For why they clear but never permanently, see can freckles be removed permanently. Worth remembering: freckles often respond to laser/light better than melasma, which is one reason you must never treat "melasma and freckles" with a single blanket protocol.
What are age spots / solar lentigines
Age spots (solar lentigo, also called sun spots or liver spots) are flat brown spots with well-defined borders, larger than freckles (a few mm to over 1cm), caused by cumulative sun damage over time. Per DermNet NZ, solar lentigines appear mainly from middle age onward in areas exposed to years of sun: the face, backs of the hands, forearms and shoulders. Unlike freckles, age spots form from a mild increase in the number of pigment cells in the basal layer plus increased melanin production, so they are persistent and do not fade seasonally — once they appear they stay year-round, may darken, but essentially do not disappear on their own.
Identifying features: separate spots, sharply defined borders, uniform color, flat with the skin surface. They are usually few in number and increase with age and a lifetime of sun exposure. Because age spots reflect years of sun damage, they are also a reminder of sun-related skin risk — so any spot that changes rapidly in color, size, border, or bleeds should be checked by a dermatologist to rule out a malignant lesion.
For treatment, because the pigment is localized with clear borders, age spots often respond well to targeted pigment methods such as selective laser, intense pulsed light (IPL) or cryotherapy — unlike melasma, which needs a gentle, comprehensive approach. This is why distinguishing "is this an age spot or melasma" directly affects whether laser should be used at all.
What is post-inflammatory hyperpigmentation (PIH)
Post-inflammatory hyperpigmentation (PIH) is a dark mark that appears exactly where the skin was previously inflamed or injured — after acne, a wound, a burn, eczema, or after skin procedures. The mechanism: the inflammatory process stimulates pigment cells to produce more melanin, or causes melanin to "drop" into the deeper dermis. This is a very common type of hyperpigmentation in people with darker skin (typical of Vietnamese skin tones), and in hot, humid climates the marks are often darker and slower to fade.
Key distinguishing clue: PIH tracks an old mark — you can usually recall "this is where I had a pimple/injury." The mark is flat with the skin surface (unlike an atrophic scar, which is depressed) and is purely a change in color. The good news is that PIH can fade on its own over months or years if the root cause is controlled (acne clears, inflammation stops) and sun protection is strict; the process can be accelerated with tyrosinase-inhibiting actives and appropriate peels.
Because PIH starts from inflammation, rule number one is to address the cause first — for example, fully treating the acne — before working on the leftover "color." If you only focus on brightening the marks while the acne keeps coming back, new marks will keep appearing. Our article Why do dark marks linger after a pimple heals? explains this mechanism and how to handle it.
Detailed comparison table: identify it in 1 minute
The table below summarizes the key distinguishing features of the four pigmentation types. It is a quick identification tool — but the final diagnosis, especially determining melasma depth, still needs a dermatologist.
| Criterion | Melasma | Freckles (ephelides) | Age spots (solar lentigo) | Post-acne marks (PIH) |
|---|---|---|---|---|
| Shape | Diffuse patch, blurred border, symmetric | Small 1–3mm scattered spots | Larger spots (mm–cm), sharp border, flat | Mark/spot tracking an old injury |
| Color | Brown to grey-brown (deep: blue-grey) | Light brown to brown | Uniform brown | Brown to dark brown/purple |
| Main cause | Hormones + UV (+ heat, light) | Genetics (MC1R) + UV | Cumulative sun damage + age | Prior inflammation/injury |
| Typical location | Cheeks, forehead, upper lip, chin | Cheeks, nose, shoulders, hands | Face, hands, forearms, shoulders | Exactly where acne/injury was |
| Age of onset | Reproductive age (20–40+), pregnancy | Childhood, darker in teens | Middle age onward | Any age, after skin inflammation |
| Seasonal change | Little; worse with sun/heat | Darker in summer, fades in winter | Does not fade seasonally | No; fades gradually over time |
| Pigment depth | Superficial / deep / mixed | Superficial (epidermal) | Epidermal (basal layer) | Epidermal and/or dermal |
| Wood's lamp | Superficial: enhanced · Deep: less so | Enhanced | Enhanced | Depends on depth |
| Treatment approach | Gentle, multi-active + strict sun protection; laser cautiously | Sun protection + selective laser/light | Targeted laser/IPL/cryotherapy | Treat the cause first + brighten/peel |
| Difficulty & outlook | Hardest; chronic, relapsing | Easier; returns without sun protection | Responds well to targeted procedures | Moderate; fades if inflammation stops |
If you remember only one thing from this table: melasma responds very differently to laser than the others. The next section explains why.
Why the right diagnosis decides the treatment
Identifying the correct pigmentation type matters because each responds differently — and with melasma, the wrong treatment (especially aggressive laser) can make it worse rather than better. This is the core message of the whole article.
Melasma needs a gentle, patient approach. The pigment cells in melasma are overactive and easily provoked; any inflammatory or heat trigger — including laser set too aggressively — can make melanocytes "backfire." The literature clearly documents rebound hyperpigmentation after laser in melasma patients, especially in darker skin: in some studies melasma recurred in all patients, and sometimes came back darker than before treatment. This is why the AAD emphasizes that the foundation of melasma care is strict sun protection + gentle topical actives (tyrosinase inhibitors), and that most patients should not start with laser. If energy is used, it must be conservative parameters, applied cautiously and by experienced hands.
By contrast, freckles and age spots usually respond well to targeted pigment methods (selective laser, IPL, cryotherapy), because the pigment is localized, the borders are clear, and the melanocytes are not as "easily angered" as in melasma. Here lies the dangerous trap: if you mistake melasma for an age spot and treat it with aggressive laser, you risk flaring the melasma. Conversely, if you mistake an age spot for melasma and only apply brightening cream, the age spot may fade very slowly or barely at all.
Post-acne marks must have the underlying inflammation addressed first. If you only chase the marks while acne keeps recurring, new marks keep forming — wasted effort. And if you mistake melasma for post-acne marks, people tend to reach for actives/peels that are too harsh, causing irritation that can inadvertently ignite melasma.
In short, a wrong diagnosis is not only less effective but can sometimes cause real harm. That is why at Eternal Beauty Center the principle is always to examine, classify and grade first, then design the protocol. And because UV is the common denominator of all four types, correct sun protection is a non-negotiable foundation regardless of your type.
How to tell them apart at home and when to see a dermatologist
You can get an initial sense at home with a few simple observations — although an accurate diagnosis (especially melasma depth) still needs a doctor. Look at your face in natural light and answer:
1. Symmetric or not? Brown patches appearing almost identically on both cheeks/forehead → think melasma. Spots in just one area, scattered → lean toward freckles/age spots. 2. Scattered spots or a diffuse patch? Many small separate spots → freckles (if small, present since childhood) or age spots (if larger, sharply bordered, middle age). A large patch with blurred edges → melasma. 3. When did it appear and does it change seasonally? Present since childhood, darker in summer, fading in winter → freckles. Appearing in middle age, fixed year-round → age spots. 4. Does it sit exactly where acne/an injury was? If the dark mark is right where you had a pimple → post-acne marks. 5. Is it raised or depressed to the touch? All four types of hyperpigmentation are flat, only a color change. If the surface is bumpy, scaly, or depressed → have a doctor assess it (it may be something other than simple pigmentation).
See a dermatologist when:
You are not sure whether it is melasma, an age spot or post-acne marks — because the treatment paths differ completely.
You suspect melasma and want to determine superficial/deep/mixed to choose the right protocol and set realistic expectations.
A spot changes rapidly in color, size or shape, has an irregular border, bleeds or itches — a malignant lesion must be ruled out.
You have used a brightening product for several months with no improvement, or your skin became irritated or darker after using it.
You have had laser and ended up darker — a classic sign of rebound hyperpigmentation that needs re-evaluation.
Getting examined early saves you a costly detour: treating the right type from the start is always faster and safer than fixing a mistake later.
Treating each type correctly at Eternal Beauty Center
At Eternal Beauty Center (Go Vap, HCMC), hyperpigmentation is handled exactly in the spirit of this article: diagnose and classify first, personalize the protocol second — not "one treatment for everyone." A dermatologist (Dr. Le Hien) personally examines the skin, distinguishes melasma from freckles/age spots/marks, and for melasma classifies it as superficial, deep or mixed to set realistic expectations before starting.
Depending on the diagnosis, the following directions can be selected and combined:
E-Mela — non-invasive melasma protocol: for confirmed melasma, especially deep and mixed melasma. Built by Dr. Hien Le, E-Mela uses a new-generation Resorcinol (a tyrosinase inhibitor) that targets pigment sitting deep (over 200 cell layers), with no peeling, no ablation and no invasion — consistent with the "gentle for melasma" principle the literature recommends. The protocol is personalized after the dermatologist examines and classifies the melasma.
Mela Peel — specialized pigment peel: a peel designed specifically for pigmentation, suited to superficial melasma and post-acne marks (PIH) — addressing the leftover "color" in the superficial layer in a controlled way.
Eternal's core difference is the correct order: diagnosis/classification first — precisely the message of this article. Because melasma is chronic, we do not promise "permanent removal"; instead, the realistic goal is to lighten, control and maintain, with strict sun protection to limit relapse. After the skin exam, the doctor gives an honest forecast of expected improvement and the timeline needed (results vary from person to person).
