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Moxi Laser for Melasma

Written & medically reviewed by the Dermapedia team
At a Glance

Moxi is not FDA-cleared for melasma. Its clearance covers actinic keratosis and benign pigmented spots — sun spots and freckles. Melasma is not in it. Providers do treat melasma with it, which is legal, but the claim was never reviewed.

The short-term results are real. The durability data is thin and mixed. The one study that followed patients to three months — a retrospective series of eleven people — found the improvement no longer significant by then. A larger randomised trial did still find benefit at three months, but by six months the objective pigment measurement on the laser-only side was no longer significantly improved, even though severity scores were.

Melasma can also be made worse by lasers. In a large series of non-ablative fractional treatments, melasma aggravation occurred in about 0.9% of cases.

Reviews rank laser below other options. A network meta-analysis put a Q-switched Nd:YAG laser combined with topicals, oral tranexamic acid, and microneedling with topicals all above non-ablative fractional and picosecond lasers. A separate meta-analysis found neither non-ablative fractional nor picosecond lasers produced a significant reduction in melasma severity at all.

Key Facts

FDA clearance for melasmaNo — Moxi is cleared for actinic keratosis and benign pigmented spots
Short-term resultsReal — significant improvement reported at 1 to 2 months
DurabilityThin and mixed — one small series lost significance at 3 months, a larger trial did not
At 6 monthsSeverity scores still improved, but the objective pigment measure was not
Risk of making it worseMelasma worsened in 0.9% of a series of non-ablative fractional treatments — mostly 1550 nm, not Moxi
How reviews rank itBelow QS Nd:YAG with topicals, oral tranexamic acid, and microneedling with topicals
Published relapse rateNone exists — be wary of any specific number
Sun protectionCentral to any melasma plan, laser or not

Why melasma is different from a sun spot

A sun spot sits in one place and can be removed. Melasma is an ongoing process — pigment-producing cells that are overactive and easily provoked, driven by a combination of sun, heat, hormones and genetics.

That is why a treatment that works beautifully on a lentigo can disappoint on melasma, and why melasma comes back.

It is also why heat matters. Lasers deliver heat, and heat is one of the things that provokes melasma. That tension sits underneath everything below.

What the evidence actually shows

Studies of 1927 nm lasers — the wavelength Moxi uses — show a real short-term effect and a much less certain long-term one.

Short term, it works. One study of 100 patients reported a large drop in melasma severity scores after two sessions. A smaller retrospective series found significant improvement at one week, one month and two months.

Longer term, the evidence splits. That same small series — eleven patients — found the improvement no longer significant at three months. But a randomised split-face trial in 46 people still found benefit at three months. By six months in that trial, severity scores were still improved from baseline while the objective melanin measurement on the laser-only side was not.

Worth knowing about that trial: it compared laser plus tranexamic acid against laser alone. "The laser-only side" means the side that did not also get the drug.

The published study of Moxi specifically was not a melasma study — it looked at pigment generally in 27 people, and even there the result had regressed toward baseline at three months.

No published relapse rate for this treatment exists. If a clinic gives you a specific percentage, ask where it comes from.

The risk of making it worse

This is the part that deserves weight.

In a retrospective study of 856 non-ablative fractional laser treatments, melasma worsened in about 0.9% of cases and darkening afterwards occurred in about 1.1%. Worth noting what that study actually was: mostly 1550 nm rather than Moxi's wavelength, in Fitzpatrick III–IV skin. No equivalent figure exists for Moxi.

Those are small numbers, but melasma is a condition where a bad outcome is stubborn and visible, and where the person seeking treatment is often already frustrated by it.

Where reviews place laser in the order

A network meta-analysis of melasma treatments ranked non-ablative fractional lasers and picosecond lasers below:

  • A Q-switched Nd:YAG laser combined with topical treatment — the top-ranked option
  • Oral tranexamic acid
  • Microneedling combined with topicals

A separate meta-analysis went further and found neither non-ablative fractional nor picosecond lasers produced a significant reduction in melasma severity.

That does not make laser useless. It means it is not where a sensible plan starts.

A more realistic order of treatment

Melasma responds best to a layered approach, and the parts of it that are least glamorous are the ones that carry the most weight.

  1. Rigorous sun protection, including visible light, which means a tinted mineral sunscreen rather than a clear one.
  2. Topical treatment, which is the backbone of nearly every successful melasma plan.
  3. Oral options where appropriate — tranexamic acid has a stronger evidence base here than laser does.
  4. Procedures, considered later rather than first, and chosen carefully.

If you have been offered a laser as an opening move for melasma, that is worth a second conversation.

If you and your provider do decide on Moxi

  • Ask what settings will be used, and whether they are being reduced for melasma specifically.
  • Ask what topical treatment you will be on before and after — laser without a topical plan is the version most likely to relapse.
  • Expect to protect the result aggressively from sun and heat.
  • Expect maintenance, not a cure.

Before you book

If you get cold sores, tell your provider. Laser treatment can reactivate the virus, and antiviral medication started in advance is the standard precaution.

Call your provider if

  • The treated area darkens over the weeks after treatment rather than clearing — this needs to be caught early
  • Your melasma looks worse rather than better a month out
  • Blistering, weeping or unexpected crusting appears
  • Redness, swelling or pain increases after day three
Questions people ask+
Is Moxi FDA-approved for melasma?No. Moxi's clearance covers coagulation of soft tissue, actinic keratosis and benign pigmented lesions such as sun spots and freckles. Melasma is not included. Using it there is off-label — legal and common, but not a reviewed claim.
Does Moxi work for melasma?In the short term, studies of this wavelength do show improvement. Durability is where the evidence gets thin and inconsistent — one small series lost significance at three months, while a larger randomised trial still found benefit then. By six months in that trial, severity scores were still improved but the objective pigment measure on the laser-only side was not.
Can Moxi make melasma worse?It can. In a retrospective study of 856 non-ablative fractional treatments — mostly at 1550 nm rather than Moxi's wavelength, in Fitzpatrick III–IV skin — melasma worsened in about 0.9% of cases and darkening afterwards occurred in about 1.1%. No equivalent figure has been published for Moxi specifically.
What works better than laser for melasma?A network meta-analysis ranked a Q-switched Nd:YAG laser combined with topicals top, followed by oral tranexamic acid and microneedling with topicals — all above non-ablative fractional and picosecond lasers. Sun protection and topical treatment are the backbone of any plan.
How many Moxi sessions for melasma?There is no established protocol, because it is not a cleared indication. Published studies of this wavelength typically used two or more sessions, with the benefit fading afterwards.
Will my melasma come back after Moxi?The published evidence suggests it commonly returns within a few months without ongoing treatment and strict sun protection. No reliable relapse percentage has been published.
Should I avoid lasers entirely if I have melasma?Not necessarily, but they are usually a later step rather than a first one, and they work best alongside topical treatment rather than instead of it. Discuss it with a dermatologist who treats melasma often.
References+
FDA 510(k) K182173 — Joule 1927 nm Laser System, cleared 6 March 2019
Source for the cleared indications. Melasma, wrinkles and texture are not among them.
Ho SG, et al. A retrospective analysis of the management of melasma with a 1927 nm fractional thulium laser. 2013. https://pubmed.ncbi.nlm.nih.gov/23384107/
Eleven patients. Significant improvement at one week, one month and two months; no longer significant at three months. This is the only study reporting loss of significance at three months, and it is small and retrospective.
Wanitphakdeedecha R, et al. The efficacy of a 1927 nm fractional thulium laser with and without tranexamic acid for melasma. Lasers Med Sci. 2020;35(9):2015–21. https://pubmed.ncbi.nlm.nih.gov/32506227/
A split-face randomised trial in 46 people comparing laser plus tranexamic acid against laser alone. Severity scores remained improved at six months; the melanin index on the laser-only side did not.
Lee SM, Kim MS, Kim YJ, et al. Adverse events of non-ablative fractional laser photothermolysis. J Dermatolog Treat. 2014;25(4):304–7. https://pubmed.ncbi.nlm.nih.gov/23639051/
A retrospective single-centre study of 856 treatments in Fitzpatrick III–IV Korean patients — 754 at 1550 nm and 102 at 1927 nm, none with Moxi. Melasma aggravation 0.9%, darkening afterwards 1.1%.
Vingan NR, et al. Evaluation of a 1927 nm thulium fractional laser. Lasers Surg Med. 2023. https://pubmed.ncbi.nlm.nih.gov/36950878/
The published Moxi study — pigment improvement at one month, regression toward baseline at three months.
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