Laser toning or pico laser for melasma?

On the pooled evidence, toning. A 2026 meta-analysis of 52 randomised trials found low-fluence Q-switched Nd:YAG significantly outperformed controls (MD 1.47; 95% CI 0.08–2.85) while picosecond lasers did not (MD −0.11; 95% CI −0.79 to 0.57). The older and cheaper option is the one with the result.

What is mottled hypopigmentation?

Small pale spots — described in the literature as punctate leukoderma or a confetti pattern — where the laser has taken out too much pigment. A 2022 review of 42 studies puts it at around 10% of East Asian patients, lasting two to three years, with fewer than 10% resolving on their own. It is linked to excessive cumulative laser energy, which means to the total course rather than to any single session.

How many sessions will I be offered?

Usually around ten, weekly or biweekly. That is what the studies used. What should worry you is an open-ended plan, because the complication that matters accumulates with the number of sessions rather than the strength of each one.

Will the melasma come back?

Very likely. The reported figures are stark and inconsistent: some studies found 100% recurrence at three months, others 64–81%, and one-year follow-up showed 58.8% relapse. Reviewers recommend combining toning with other melasma treatment rather than relying on it alone.

Is it safe for darker skin?

It is used across Fitzpatrick types II–V, but the pattern of risk changes. Rebound hyperpigmentation was reported more often in types IV–V, and mottled hypopigmentation is reported particularly in East Asian patients. Both directions of pigment failure are on the table, which is why fluence and session count should be chosen by someone who does this often.

What should I ask a South Korean clinic?

Which laser platform and what fluence, how many sessions in total and whether that is capped, what else is being used alongside it, and what happens if pale spots appear. A clinic that raises mottled hypopigmentation before you do is one worth staying with.

Treatments · also called 레이저토닝, 듀얼토닝, low-fluence Q-switched Nd:YAG

Laser toning: the cheaper option that outperformed the expensive one

Laser toning outperformed pico lasers for melasma in pooled trials. But roughly 10% of East Asian patients develop mottled hypopigmentation that lasts years.

Author: Aesthetics Korea Editorial Team
Medical review: Reviewed by 2 doctorsSee methodology
Published: 8 September 2026
Last updated: 8 September 2026
Last reviewed: —5 min read

Short answer

Laser toning is repeated low-energy passes with a Q-switched Nd:YAG laser, and in the pooled melasma evidence it is the technique that worked — significantly better than controls, where picosecond lasers were not. The catch is specific and matters most to the readers of this page: mottled hypopigmentation has been reported in around 10% of East Asian patients, it is driven by cumulative energy, and it lasts years.

Key facts

What it is: Repeated low-fluence 1064 nm Q-switched Nd:YAG passes over an area — a technique, not a device
Typical course: Around 10 sessions, weekly or biweekly, at 0.5–3.8 J/cm² with a 6–10 mm spot
Efficacy: Significant improvement in pooled melasma trials (MD 1.47; 95% CI 0.08–2.85); pico lasers were not
Main risk: Mottled hypopigmentation in roughly 10% of East Asian patients, lasting 2–3 years
Recurrence: 58.8% relapse at one year; reported 3-month recurrence ranges from 64% to 100%
Honest framing: Melasma is managed, not cured. More sessions is not a safer plan

What laser toning is

Repeated low-energy passes of a 1064 nm Q-switched Nd:YAG laser across an area, rather than targeted shots at individual marks. The idea is to break down pigment gradually, below the threshold that would injure the surrounding skin.

It is a technique, not a device. The same word is sold on several laser platforms, and in South Korea you will see it as 레이저토닝, 듀얼토닝, 피코토닝 and 제네시스토닝 depending on the machine. So "toning" tells you what is being done, not what with — ask which laser and at what setting.

The published protocol is fairly consistent: around 10 sessions, weekly or biweekly, at 0.5–3.8 J/cm² with a 6–10 mm spot.

It beat the expensive option

This is the finding worth travelling with, because it runs against how these treatments are priced.

A 2026 meta-analysis of 52 randomised trials covering 1,058 patients tested laser therapies for melasma. Low-fluence Q-switched Nd:YAG — the laser behind classic toning — showed a significant improvement over controls (MD 1.47; 95% CI 0.08 to 2.85). Picosecond lasers, the newer and more costly technology, did not (MD −0.11; 95% CI −0.79 to 0.57).

The older technique is the one with the result. A clinic steering you toward a pico platform for melasma on the grounds that it is newer is not citing this.

The complication nobody quotes

Now the part that should shape your decision, and it is specific to readers with East Asian skin.

A 2022 systematic review of 42 studies and 1,736 melasma patients reports mottled hypopigmentation in around 10% of East Asian patients — small pale spots, described in the literature as punctate leukoderma or a confetti pattern, where too much pigment has been removed.

Three details make it serious:

It lasts two to three years.
Fewer than 10% resolve on their own.
It is associated with excessive cumulative laser energy — the total across the course, not the strength of one session.

That last point inverts the usual reassurance. "We use very low energy" is not protective if the answer to "how many sessions?" is open-ended. The risk is in the running total.

Pigment can also fail in the other direction: rebound hyperpigmentation was reported more often in Fitzpatrick types IV–V.

It comes back

Melasma is chronic, and the recurrence figures are both high and unstable across studies. At three months, reported recurrence ranges from 64–81% in some studies to 100% in others. At one year, 58.8% relapse.

The reviewers' own recommendation follows from that: combine toning with other melasma treatment rather than relying on it alone, which reduces both recurrence and adverse events.

So the honest framing is management, not cure — and a course sold as a fix is being sold against its own literature.

What to ask at a consultation

Which laser platform, and what fluence? Get the Korean product name and check it on the MFDS device portal.
How many sessions in total, and is that capped? An open-ended plan is the shape the risk takes.
What else are you using alongside it? The reviewers say combination is what reduces recurrence.
What is the plan if pale spots appear? Ask before, not after.
What happens when I stop? For melasma, maintenance is the normal case.

A clinic that brings up mottled hypopigmentation before you do has read the same literature you just did.

The bottom line

For melasma, laser toning is the technique with the pooled evidence behind it — significantly better than controls across 52 randomised trials, where picosecond lasers were not. But roughly 10% of East Asian patients develop mottled hypopigmentation that persists for two to three years and rarely clears on its own, and it accumulates with the number of sessions. Melasma also recurs in most people, with 58.8% relapsing within a year. Treat it as a managed condition, cap the course, and combine rather than repeat.

Frequently asked questions

Laser toning or pico laser for melasma?: On the pooled evidence, toning. A 2026 meta-analysis of 52 randomised trials found low-fluence Q-switched Nd:YAG significantly outperformed controls (MD 1.47; 95% CI 0.08–2.85) while picosecond lasers did not (MD −0.11; 95% CI −0.79 to 0.57). The older and cheaper option is the one with the result.
What is mottled hypopigmentation?: Small pale spots — described in the literature as punctate leukoderma or a confetti pattern — where the laser has taken out too much pigment. A 2022 review of 42 studies puts it at around 10% of East Asian patients, lasting two to three years, with fewer than 10% resolving on their own. It is linked to excessive cumulative laser energy, which means to the total course rather than to any single session.
How many sessions will I be offered?: Usually around ten, weekly or biweekly. That is what the studies used. What should worry you is an open-ended plan, because the complication that matters accumulates with the number of sessions rather than the strength of each one.
Will the melasma come back?: Very likely. The reported figures are stark and inconsistent: some studies found 100% recurrence at three months, others 64–81%, and one-year follow-up showed 58.8% relapse. Reviewers recommend combining toning with other melasma treatment rather than relying on it alone.
Is it safe for darker skin?: It is used across Fitzpatrick types II–V, but the pattern of risk changes. Rebound hyperpigmentation was reported more often in types IV–V, and mottled hypopigmentation is reported particularly in East Asian patients. Both directions of pigment failure are on the table, which is why fluence and session count should be chosen by someone who does this often.
What should I ask a South Korean clinic?: Which laser platform and what fluence, how many sessions in total and whether that is capped, what else is being used alongside it, and what happens if pale spots appear. A clinic that raises mottled hypopigmentation before you do is one worth staying with.

Medical evidence

Systematic review2026n = 1058
Efficacy and Safety of Laser-Based Therapies for Melasma: A Systematic Review and Meta-Analysis
Low-fluence Q-switched Nd:YAG 1064 nm significantly outperformed controls (MD 1.47; 95% CI 0.08 to 2.85), while picosecond lasers did not (MD −0.11; 95% CI −0.79 to 0.57). "Laser-based therapies, particularly low-fluence QSNY lasers, are effective adjunctive tools for melasma management. However, they should not be considered a panacea."
Systematic review2022n = 1736
The Low-Fluence Q-Switched Nd:YAG Laser Treatment for Melasma: A Systematic Review
"Excessive cumulated laser energy is known to be associated with the development of MH [mottled hypopigmentation]. There is a lack of long-term studies… by using LFQSNY combined with other melasma treatment modalities, recurrence rates as well as adverse events can be reduced."

Sources

Listed in the order they are used. Source class follows the methodology.

1.Efficacy and Safety of Laser-Based Therapies for Melasma: A Systematic Review and Meta-Analysis, Cureus, 2026Peer-reviewed researchaccessed 2026-09-0852 randomised controlled trials, 1,058 participants. Low-fluence Q-switched Nd:YAG 1064 nm significantly effective (MD 1.47; 95% CI 0.08–2.85); picosecond lasers not significantly better than controls (MD −0.11; 95% CI −0.79 to 0.57); overall pooled analysis a non-significant trend (MD 0.70; p = 0.2682). Post-inflammatory hyper- and hypopigmentation particularly with high fluences.
2.The Low-Fluence Q-Switched Nd:YAG Laser Treatment for Melasma: A Systematic Review, Medicina (Kaunas), 2022Peer-reviewed researchaccessed 2026-09-0842 articles (19 randomised, 15 non-randomised, 8 retrospective), 1,736 melasma patients, Fitzpatrick types II–V. Typical protocol 5–15 sessions (usually 9–10), weekly or biweekly, 6–10 mm spot, 0.5–3.8 J/cm². Mottled hypopigmentation reported in about 10% of East Asian patients, described as punctate leukoderma lasting 2–3 years with under 10% resolving spontaneously. Rebound hyperpigmentation more frequent in types IV–V. Recurrence at three months reported from 64–81% up to 100%; one-year relapse 58.8%.
3.의료기기 안심책방 (MFDS medical device information portal), Ministry of Food and Drug SafetyGovernment / public bodyaccessed 2026-09-08Where the Korean licence for a specific laser platform is looked up, under its Korean product name. "Toning" is a setting, so the licence is on the machine.

Concerns it addresses

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