Glycolic acid or TCA for melasma?

The pooled evidence favours glycolic acid. A meta-analysis of ten randomised trials and three prospective studies, 478 patients with darker skin types, found glycolic acid ahead of trichloroacetic acid on the melasma area and severity index (MD −1.89; 95% CI −3.26 to −0.52; p = 0.007). Deeper and harsher is not automatically better.

Are peels better than creams?

Partly, and the detail is interesting. In the same analysis, trichloroacetic acid (MD −5.30) and Jessner's solution (MD −3.20) both beat topical hydroquinone. But glycolic acid did not beat tretinoin, vitamin C iontophoresis, or amino fruit acid — none of those comparisons reached significance. So a peel is not reliably better than a good topical.

How long do the results last?

Not long without maintenance, which is the point most price lists omit. A 2025 review of a sequential glycolic acid and trichloroacetic acid protocol found significant improvement at twelve weeks — and a 70% melasma recurrence rate by twelve weeks after treatment stopped. The meta-analysis conclusion says the same thing more gently: peels work "with the use of topicals as maintenance treatment".

Are peels safe for Asian skin?

Superficial peels are used routinely across pigmented skin types, and the complication to expect is transient hyperpigmentation rather than scarring. In the 2025 study — in Fitzpatrick IV–VI African patients, so a different population from most readers here — irritation occurred in 77.5%, post-peel cracking in 62.5%, and transient hyperpigmentation in 12.5%, with no scarring. Depth is what carries the risk, so ask what depth is planned.

Peel or laser for pigmentation?

Different tools with a similar honest framing: both manage melasma rather than cure it, and both recur without maintenance. The practical differences are cost, downtime and the risk profile in your skin. If a clinic proposes one without discussing what you will use afterwards, that is the gap to press on.

What should I ask a South Korean clinic?

Which agent and at what concentration, and what depth they are aiming for. How many sessions and the total. What topical maintenance they expect you to be on afterwards, and how you get it at home. And what happens if you darken after a session.

Treatments · also called 필링, 케미컬 필링, 화학박피

Chemical peels: the cheap agent that beat the aggressive one

In pooled melasma trials in darker skin, glycolic acid outperformed trichloroacetic acid. And the maintenance topicals matter more than the peel itself.

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

Peels do work for melasma as a single treatment in darker skin, and the agent everyone assumes is weakest came out ahead: pooled across 478 patients, glycolic acid beat trichloroacetic acid on the melasma severity index. The more important finding is what happens afterwards — the same literature treats maintenance topicals as part of the treatment, and one study saw 70% recurrence within twelve weeks of stopping.

Key facts

What it is: A controlled chemical injury removing outer skin layers; depth decides result and risk
Common agents: Glycolic acid, salicylic acid, Jessner's solution, trichloroacetic acid
Pooled finding: Glycolic acid beat trichloroacetic acid on melasma severity (MD −1.89; 95% CI −3.26 to −0.52)
Against topicals: TCA and Jessner's both beat topical hydroquinone; glycolic acid did not beat tretinoin
The real variable: Maintenance. One protocol saw 70% recurrence twelve weeks after treatment stopped
In pigmented skin: Transient hyperpigmentation is the common complication, not scarring

What a peel is

A controlled chemical injury. An acid removes the outer layers of skin, and the skin that replaces them is more even in pigment and texture.

The variable that matters is depth, not brand. Superficial peels reach the epidermis; deeper ones go further, work harder, and carry more risk — particularly in skin that pigments easily. In South Korea you will see 필링 on almost every price list, usually as the cheapest item, and usually without the depth stated.

Common agents: glycolic acid, salicylic acid, Jessner's solution, trichloroacetic acid.

The agent that won was the mild one

A meta-analysis of ten randomised trials and three prospective studies, covering 478 patients with darker skin types, tested peels as single agents for melasma.

Glycolic acid outperformed trichloroacetic acid on the melasma area and severity index — MD −1.89 (95% CI −3.26 to −0.52; p = 0.007).

This is the second time on this site that the gentler, cheaper option has come out ahead of the aggressive one for melasma; laser toning did the same against picosecond lasers. It is worth noticing as a pattern rather than a coincidence: melasma responds poorly to force.

Peels against creams

The same analysis compared peels with topical treatments, and the results cut both ways.

Where peels won:

Trichloroacetic acid beat topical hydroquinone — MD −5.30 (p < 0.001)
Jessner's solution beat topical hydroquinone — MD −3.20 (p = 0.004)

Where they did not:

Glycolic acid did not beat tretinoin (MD 0.53; p = 0.3)
Nor vitamin C iontophoresis (MD 1.50; p = 0.14)
Nor amino fruit acid (MD 0.39; p = 0.46)

So a peel is better than one particular cream, and not better than several others. That is a narrower claim than a clinic menu implies.

The part that decides your result

The reviewers' conclusion contains a qualifier that is easy to read past, and it is the whole practical lesson: peels are effective for melasma in darker skin "with the use of topicals as maintenance treatment".

A 2025 retrospective review puts a number on what happens without it. A sequential glycolic acid and trichloroacetic acid protocol produced significant improvement at twelve weeks — and melasma recurrence reached 70% by week 12 after treatment stopped.

For someone flying in for a course of peels, that reframes the purchase. The peels are the beginning. What you use for the following year is the treatment.

Ask what maintenance topical is expected, and whether you can obtain it at home, before you book the course.

What the side effects look like

From the same 2025 study — and note the population is Fitzpatrick IV–VI African patients, not East Asian skin, so read the direction rather than the exact numbers:

Irritation — 77.5%
Post-peel cracking — 62.5%
Transient hyperpigmentation — 12.5%
Scarring — none observed

The common complications are uncomfortable rather than dangerous, and the one to plan around is temporary darkening, which is exactly the thing you came to treat. It is a reason to have a first session well before any event, and to ask what the clinic does if it happens.

What to ask at a consultation

Which agent, at what concentration, and to what depth?
How many sessions, at what interval, and what is the total?
What topical will I be on afterwards, and for how long? If there is no answer, the plan is incomplete.
What do you do if I darken after a session — and can that be handled before I fly home?
If a device-based peel system is used, what is its Korean product name?

The bottom line

Chemical peels work as single agents for melasma in pigmented skin, and glycolic acid outperformed trichloroacetic acid across 478 patients — the milder agent, again. They beat topical hydroquinone but not tretinoin or vitamin C iontophoresis. The finding that should shape your booking is what happens after: melasma recurred in 70% of patients within twelve weeks of stopping, and the reviewers treat maintenance topicals as part of the treatment rather than an optional extra.

Frequently asked questions

Glycolic acid or TCA for melasma?: The pooled evidence favours glycolic acid. A meta-analysis of ten randomised trials and three prospective studies, 478 patients with darker skin types, found glycolic acid ahead of trichloroacetic acid on the melasma area and severity index (MD −1.89; 95% CI −3.26 to −0.52; p = 0.007). Deeper and harsher is not automatically better.
Are peels better than creams?: Partly, and the detail is interesting. In the same analysis, trichloroacetic acid (MD −5.30) and Jessner's solution (MD −3.20) both beat topical hydroquinone. But glycolic acid did not beat tretinoin, vitamin C iontophoresis, or amino fruit acid — none of those comparisons reached significance. So a peel is not reliably better than a good topical.
How long do the results last?: Not long without maintenance, which is the point most price lists omit. A 2025 review of a sequential glycolic acid and trichloroacetic acid protocol found significant improvement at twelve weeks — and a 70% melasma recurrence rate by twelve weeks after treatment stopped. The meta-analysis conclusion says the same thing more gently: peels work "with the use of topicals as maintenance treatment".
Are peels safe for Asian skin?: Superficial peels are used routinely across pigmented skin types, and the complication to expect is transient hyperpigmentation rather than scarring. In the 2025 study — in Fitzpatrick IV–VI African patients, so a different population from most readers here — irritation occurred in 77.5%, post-peel cracking in 62.5%, and transient hyperpigmentation in 12.5%, with no scarring. Depth is what carries the risk, so ask what depth is planned.
Peel or laser for pigmentation?: Different tools with a similar honest framing: both manage melasma rather than cure it, and both recur without maintenance. The practical differences are cost, downtime and the risk profile in your skin. If a clinic proposes one without discussing what you will use afterwards, that is the gap to press on.
What should I ask a South Korean clinic?: Which agent and at what concentration, and what depth they are aiming for. How many sessions and the total. What topical maintenance they expect you to be on afterwards, and how you get it at home. And what happens if you darken after a session.

Medical evidence

Systematic review2020n = 478
Efficacy and tolerability of chemical peeling as a single agent for melasma in dark-skinned patients: A systematic review and meta-analysis of comparative trials
"Chemical peelings are effective as single agents for management of melasma in patients with darker skin types, with the use of topicals as maintenance treatment." Glycolic acid favoured over trichloroacetic acid on MASI (MD −1.89; 95% CI −3.26 to −0.52; p = 0.007).
Cohort study2025n = 40
The effects and safety of sequential high concentration glycolic acid and trichloroacetic acid chemical peels in skin photo-type IV-VI
"Despite recurrences, this study found that a sequential chemical peel protocol using glycolic acid and trichloroacetic acid was effective in reducing melasma severity without causing scarring." Recurrence reached 70% by week 12 after treatment ceased.

Sources

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

1.Efficacy and tolerability of chemical peeling as a single agent for melasma in dark-skinned patients: A systematic review and meta-analysis of comparative trials, Journal of Cosmetic Dermatology, 2020Peer-reviewed researchaccessed 2026-09-08Ten randomised controlled trials and three prospective comparative studies, 478 patients. Glycolic acid favoured over trichloroacetic acid on MASI (MD −1.89; 95% CI −3.26 to −0.52; p = 0.007). Glycolic acid not favoured over tretinoin (MD 0.53; p = 0.3), vitamin C iontophoresis (MD 1.50; p = 0.14) or amino fruit acid (MD 0.39; p = 0.46). Trichloroacetic acid (MD −5.30; p < 0.001) and Jessner's solution (MD −3.20; p = 0.004) both favoured over topical hydroquinone.
2.The effects and safety of sequential high concentration glycolic acid and trichloroacetic acid chemical peels in skin photo-type IV-VI, a retrospective cross-sectional monocentric review, International Journal of Women's Dermatology, 2025Peer-reviewed researchaccessed 2026-09-08Retrospective single-centre review of 40 patients, 92.5% female, 77.5% Fitzpatrick phototype V, African population. Significant improvement in modified MASI at twelve weeks. Adverse effects: irritation 77.5%, post-peel cracking 62.5%, transient hyperpigmentation 12.5%, no scarring. Melasma recurrence reached 70% by week 12 after treatment stopped. The authors note the retrospective single-centre design as a limitation.
3.의료기기 안심책방 (MFDS medical device information portal), Ministry of Food and Drug SafetyGovernment / public bodyaccessed 2026-09-08Some peel and hydro-peel systems sold in South Korea are registered devices and are looked up here under their Korean product names.

Concerns it addresses

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