The Complete Guide to Melasma — Causes, Triggers, and Treatment Hierarchy

Medically reviewed by Dr. Dan Xu, M.D., CCFP — CPSO Licensed Physician and Founder & Medical Director of ID Cosmetic Clinic, Markham. Last updated June 2026.

For many of our patients in Markham — particularly women with Asian skin — melasma is a frustrating part of daily life. You wash your face in the morning and there it is in the mirror: a brown-grey patch across the cheekbones. You cover it with concealer, get through the day, remove your makeup at night, and it is still there. You may have tried countless brightening serums, fade kits, and even laser, with results that flickered or, worse, came back darker. This is not because your skin is uniquely stubborn. It is because melasma was never the kind of pigment problem you can solve in a single appointment. Understanding that is the first real step to improving it.

What is melasma?

Melasma (sometimes called “liver spots” colloquially, or chloasma when it appears in pregnancy) is a chronic, acquired increase in skin pigment. Its most recognizable feature is symmetry: it typically appears on both cheekbones, the upper lip, the forehead, or the jawline, with the two sides roughly mirroring each other. The patches range from light brown to deep grey-brown, with edges that are reasonably defined but irregular — unlike a sun spot, which is round and isolated, or an age spot, which has a sharper outline.

What truly sets melasma apart from other facial pigment is its hormone dependence and persistence. A sun spot (solar lentigo) is usually the legacy of UV exposure — an isolated, finished injury. Post-inflammatory hyperpigmentation (PIH) follows a clear inflammatory event, like a popped pimple. Melasma, by contrast, is an ongoing physiological state: as long as the triggers driving it are not controlled, it persists or returns. This is why it deserves a different mindset than the spots around it.

The three types of melasma — and why classification matters

Dermatologically, melasma is sorted by how deep the pigment sits. This is not academic trivia; it directly changes what treatment is safe and what result is realistic. A Wood’s lamp examination at consultation helps estimate the depth.

• Epidermal melasma: pigment sits mostly in the upper skin (epidermis), tends to look more brown, shows sharp borders under a Wood’s lamp, and responds relatively well to topical brighteners and gentle laser.
• Dermal melasma: pigment reaches deeper into the dermis, looks more grey-blue, has blurry borders under a Wood’s lamp, and is harder to treat with a higher tendency to relapse. When laser is used for the dermal component, Dr. Xu uses the 1064 nm PicoWay laser at low energy.
• Mixed melasma: the most common type — both epidermal and dermal pigment together, requiring a layered, combination approach rather than any single tool.

Why melasma happens: causes and triggers

Melasma is the product of several overlapping factors. You cannot manage it well without understanding each one, because management is really about removing or reducing triggers.

• Hormonal fluctuation: estrogen and progesterone directly activate the skin’s pigment cells (melanocytes), prompting them to make more melanin. This is why melasma so often appears or worsens during pregnancy, while on oral contraceptives, or during hormone replacement therapy. The large majority of people with melasma are women.
• Ultraviolet (UV) light: UV is one of the most powerful triggers. Even brief sun exposure activates melanocytes and accelerates pigment deposition — and UV also damages the skin barrier, leaving skin more vulnerable to every other trigger.
• Heat and visible light: research now shows that visible light (especially blue light) and infrared heat can activate melanocytes even without any UV. That means indoor light, screens, cooking heat, and hot steam can all contribute, on cloudy days and indoors alike.
• A damaged skin barrier: over-cleansing, harsh actives, frequent exfoliation, or overly aggressive laser can break the barrier, create low-grade inflammation, and set off PIH that layers on top of melasma — making the whole picture more complex.
• Genetics: a family history is a meaningful risk factor, and people of Asian, Latin, and Middle Eastern background develop melasma at notably higher rates than those of Northern European descent.
• Stress and poor sleep: elevated cortisol nudges the broader hormonal balance, and insufficient sleep blunts the skin’s repair capacity — both can slow progress, even if neither “causes” melasma alone.

Why is melasma so hard to treat?

The honest answer most fade-kit ads will not give you: melasma is not a finished injury — it is a process still happening. As long as the triggers are active (hormones unbalanced, sun protection inconsistent, barrier still irritated), pigment keeps being produced. Any treatment that only removes existing pigment is suppressing a symptom, not switching off the source.

The rebound mechanism. Lasers and chemical peels can clear pigment that is already there, but they do little to calm the underlying over-activity of the melanocytes. After treatment, if sun protection and maintenance lapse, the cleared area can repigment within weeks to months — sometimes darker than before, because the treatment itself caused mild inflammation that further provoked the pigment cells.

The Asian-skin challenge. Fitzpatrick III–V skin (covering most Asian patients) has naturally more reactive melanocytes. In practical terms:

• it is more sensitive to heat and light, so PIH is triggered more easily;
• the safe window for laser is narrower — too much energy “provokes” the pigment cells and causes darkening;
• it needs a more conservative, lower-energy plan, and treatment usually takes longer than in lighter skin.

The most common mistake: a high-energy laser to “fix it in one go.” This is the single most dangerous misconception in melasma care. Aggressive Q-switched or high-energy fractional lasers can look impressive on isolated spots in lighter skin, but on Asian melasma the excess heat damages tissue, wakes up deep pigment cells, and produces patches weeks later that are darker than the original — post-inflammatory hyperpigmentation. That rebound is sometimes harder to manage than the melasma you started with. This article is general information, not medical advice.

The melasma treatment hierarchy: from foundation to advanced

Treating melasma is not about “stronger is better” or “more expensive is better.” It is about matching the level of intervention to pigment depth, skin type, and how well the triggers are controlled. Dr. Dan Xu generally builds a plan in the following order — each layer supports the next, and skipping the foundation undermines everything above it.

Tier 1 — Sun protection (mandatory, irreplaceable)

Any treatment without sun protection is wasted. A broad-spectrum SPF 50+ — ideally a mineral or hybrid formula containing iron oxide, because iron oxide blocks visible light that pure UV filters cannot — must be used every single day, sun or cloud, indoors or out. This is the only step in melasma care that can work on its own: with diligent protection alone, some epidermal melasma fades over months.

Tier 2 — Topical brighteners (the home foundation)

Ingredients such as cysteamine, azelaic acid, tranexamic acid, and alpha-arbutin interrupt the melanin-synthesis pathway through different mechanisms, reducing new pigment. They have low side-effect profiles and suit long-term use. Hydroquinone is the strongest topical, but it is not for indefinite use — it is generally a short, supervised intensification, not a forever cream.

Tier 3 — Professional peels (clinic level)

Low-strength glycolic acid peels and Jessner’s solution accelerate epidermal turnover, helping existing pigment shed faster and working synergistically with topical brighteners. They suit epidermal melasma and should be performed in a professional medical setting at conservative strengths to avoid triggering inflammation.

Tier 4 — Laser and light therapy (advanced, physician-assessed)

Picosecond lasers and gentle laser-toning protocols are the most commonly used energy-based options for melasma. Which device, and at what settings, depends on pigment type, skin type, and treatment history — covered in detail in the next section.

Tier 5 — Systemic support (adjunct, not a substitute)

Oral tranexamic acid has reasonable clinical evidence for an adjunctive role, and intravenous glutathione (“brightening IV”) is increasingly used as a systemic antioxidant adjunct. On their own these have limited effect, but as part of a combination plan they may improve the pace and durability of overall improvement.

Laser for melasma: which is safer for Asian skin?

Laser is the most talked-about — and most easily misused — tool in melasma care. For Asian-skin patients, the choice of device and the energy used are fundamentally safety questions, not just efficacy ones.

The risk of traditional high-energy laser. High-energy Q-switched Nd:YAG and CO₂ fractional devices can clear a lot of pigment in one pass, but the heat and inflammation they generate carry real risk in Fitzpatrick III–V skin: rebound darkening (PIH), uneven pigment, and temporary loss of pigment. These devices are excellent for freckles and age spots in lighter skin, but for Asian melasma they must be dialled far down — which often conflicts with the one-session “wow” result patients are promised.

Why picosecond laser suits melasma better. A picosecond laser delivers ultra-short pulses that shatter pigment through a photomechanical (acoustic) effect rather than burning it with heat. Compared with older nanosecond lasers, the surrounding heat spread is minimal, which substantially lowers rebound risk; lower energy densities can achieve precise pigment breakup; and some platforms add a focus-lens array that stimulates collagen in the dermis, improving texture as well as tone. The 755nm wavelength is reasonably suited to Asian melanin, and in experienced hands the rebound rate is meaningfully lower than with traditional laser. ID Cosmetic Clinic uses picosecond technology of this category.

One crucial caveat: even a picosecond laser, set too high, can trigger rebound. Safety depends on a physician familiar with Asian skin assessing you first and using a low-energy, multi-session, gradual approach — not chasing the visual impact of a single treatment.

Laser toning — a gentler line of thinking. Low-fluence, large-spot long-pulse 1064nm protocols pass over the whole face at very low energy. The aim is not to destroy pigment but to gently modulate melanocyte activity and even out overall tone, with almost no risk of surface injury and minimal downtime. This suits the maintenance phase (preventing relapse), dermal-type melasma, patients with a history of rebound, and the intervals between picosecond sessions. In practice, Dr. Dan Xu often combines picosecond and toning protocols, adjusting dynamically to each patient’s pigment type and response rather than selling a fixed package.

From within: glutathione and “brightening IV”

Glutathione is a naturally occurring antioxidant used in aesthetics for “whole-body brightening.” The proposed mechanisms for intravenous glutathione include inhibiting tyrosinase (the key enzyme in melanin synthesis), shifting darker eumelanin toward lighter pheomelanin, and reducing free-radical activation of pigment cells. A realistic expectation matters here:

• IV glutathione is not a standalone melasma treatment; alone its effect is limited and highly variable between individuals;
• as an adjunct — alongside laser, topicals, and sun protection — it may help speed overall improvement;
• any effect typically emerges over a course (often 4–8 sessions), not in a single visit;
• it should be done under physician supervision, with the indication and dose confirmed, to avoid the safety risks of overuse.

At ID Cosmetic Clinic, brightening IV is never sold as a standalone “whitening package.” It is offered only after a physician assessment, as one systemic adjunct within a comprehensive melasma plan.

Managing melasma: the long view and realistic expectations

Melasma is a chronic skin state, not a one-time skin “problem.” Accepting that is the precondition for an effective strategy.

Why maintenance is necessary. Even after a full course of laser and topical brightening, most patients see some degree of relapse within months to a year — especially in summer (strong UV), during hormonal change (switching contraceptives, trying to conceive, postpartum), or after sun protection slips. Maintenance is not a sign that treatment “failed.” It is how you manage a chronic condition: continuous, low-dose intervention to hold the improvement you earned.

Sunscreen is the cornerstone. No matter how advanced the laser or how effective the cream, without daily, rigorous sun protection every gain is temporary. Use an SPF 50+, PA++++ broad-spectrum product, ideally containing iron oxide to block visible light; protect indoors too, especially near windows or screens; reapply every 2–3 hours when outdoors; and add a hat and sunglasses as physical defence.

Seasonal strategy in Toronto. Toronto summers (May–September) carry far stronger UV than winter and are the highest-risk window for melasma flares. A sensible rhythm is to complete a laser course 1–2 months before summer to build a foundation, then switch to pure maintenance through summer (intensified sun protection plus topicals, pausing higher-energy laser). Autumn and winter, with weaker UV and lower rebound risk, are the best time to run laser treatment.

As for results: with a well-built combination plan, most patients can expect melasma to become significantly fainter and easier to camouflage, and to stay controlled with maintenance. What no honest physician will promise is permanent, total clearance from a single device. Pricing for a personalized plan is shared at consultation and depends on pigment type and the tiers involved — typically in the range of Quoted at consultation per session for laser, with topicals and maintenance quoted separately.

Who should be cautious or wait?

Melasma care is generally safe, but timing and screening matter. Laser is usually deferred during pregnancy and while breastfeeding, and is best reassessed once hormone levels are stable. Tell your physician about any history of rebound darkening, an active skin infection or open irritation in the area, recent isotretinoin use, a keloid or scarring tendency, or photosensitizing medications. If you are on oral contraceptives or hormone therapy, that does not rule out treatment — but it does make sun protection and maintenance even more important, and it is worth discussing options with your prescribing doctor. A proper consultation, including a Wood’s lamp assessment, screens for all of this before any energy is used. This article is general information, not medical advice.

The real takeaway

Melasma is not a skin “destiny” you are stuck with — but it is also not something one laser machine resolves for good. It needs the right diagnosis (distinguishing pigment type and depth), the right combination of treatments rather than a single tool, and long-term lifestyle support, with sun protection that never gets compromised. If you have tried many things without lasting results, or you are not sure whether your patches are melasma or another kind of pigment, a consultation is the most valuable first step.

Frequently asked questions

What is the difference between melasma and sun spots — can they be treated the same way?

No. Sun spots (solar lentigines) come from UV exposure, tend to be round and isolated, respond very well to laser, and usually clear in 1–2 sessions with low relapse. Melasma is chronic and hormone-dependent, responds more unpredictably, and cannot be treated with the same settings or expectations. The two can coexist on the same face and need to be assessed separately.

Why does my melasma keep coming back?

Because melasma is a process, not a finished injury. As long as triggers stay active — UV, heat, hormones, a damaged barrier — pigment keeps being produced. Treatment removes existing pigment, but only ongoing sun protection and maintenance keep it from returning.

Is melasma curable?

It is better thought of as controllable than curable. With the right combination plan, melasma can become much fainter and stay faint with maintenance. Permanent, total clearance from one treatment is not a realistic promise, especially on Asian skin.

What is the best laser for melasma on Asian skin?

For Fitzpatrick III–V skin, low-energy approaches — picosecond laser and gentle laser-toning protocols — are generally safer than high-energy Q-switched or fractional lasers, which can cause rebound darkening. The safest factor is not the device alone but conservative, multi-session settings chosen by a physician experienced with Asian skin.

My melasma got darker after laser — is that normal?

That is post-inflammatory hyperpigmentation (rebound), a complication to watch for in laser treatment of Asian skin. It usually follows energy that was too high, inadequate post-treatment sun protection, or a barrier that was already irritated. Mild rebound often settles in 4–8 weeks; contact your clinic rather than layering on more actives or laser.

I take oral contraceptives — can my melasma still improve?

It can improve, though full clearance is harder while the hormonal trigger is active. If appropriate, your physician may suggest discussing alternative contraception with your prescriber. If staying on the pill, a combination plan — laser plus topical brightening plus rigorous sun protection — can still achieve clear improvement, with maintenance being especially important.

How many treatments does melasma need, and how long does it take?

It depends on pigment depth (epidermal, dermal, or mixed), Fitzpatrick type, hormonal status, and lifestyle. Many patients need several low-energy laser sessions spaced 4–6 weeks apart, alongside continuous topicals and sun protection, with the first course often spanning 4–6 months. Visible improvement usually begins after the second or third session, followed by periodic maintenance.

I developed the “pregnancy mask” — will it fade on its own after birth?

Some of it may. Pregnancy-related melasma (chloasma) fades noticeably in a portion of patients within 6–12 months as estrogen falls. If it has not significantly improved by 12 months postpartum, spontaneous fading is less likely and medical input is worthwhile. Topical treatment can start after breastfeeding ends; laser is usually reassessed once hormones are stable.

Can sunscreen alone improve melasma?

For some epidermal melasma, yes — diligent daily broad-spectrum SPF 50+ with iron oxide can fade it over months. Sunscreen is the one step that can work on its own and the foundation under every other tier; without it, other treatments tend to be temporary.

Is glutathione IV an effective melasma treatment?

Not as a standalone. On its own, IV glutathione has limited and variable effect. It is best viewed as a systemic adjunct within a combination plan, used under physician supervision, with any benefit emerging over a course rather than a single session.

Related at ID Cosmetic Clinic

• Condition: Melasma & Hyperpigmentation
• Treatment: Picosecond Laser for Pigmentation
• Treatment: Chemical Peels & Brightening (Glutathione) IV
• Read next: Post-Inflammatory Hyperpigmentation (PIH): A Practical Guide