The short answer
Research suggests that some picosecond laser protocols can reduce melasma scores, including in Asian skin. The evidence does not show that every wavelength or device works equally, that Pico is always better than Q-switched laser or topical treatment, or that the improvement is permanent. Post-inflammatory hyperpigmentation (PIH) and relapse remain possible.
A responsible clinic should describe Pico as one possible part of a longer control plan — not as a one-course cure.
Melasma is not every brown mark
- Melasma: usually patchy, symmetrical pigmentation on sun-exposed facial areas. Ultraviolet and visible light and hormonal factors are established triggers; heat or inflammation may aggravate some cases.
- Freckles: small spots that are often influenced by genetics, darken with ultraviolet exposure and may fade seasonally.
- Solar lentigines: more sharply defined spots linked to cumulative ultraviolet exposure that usually persist rather than fading seasonally.
- Post-inflammatory hyperpigmentation: pigment left after acne, irritation, burns or procedures.
- Other pigment disorders: some conditions can resemble melasma and should not be treated from a photograph or sales consultation alone.
If the diagnosis is wrong, the laser plan can be wrong even when the machine is genuine. Diagnosis comes before wavelength, fluence or package size.
What the evidence says about Pico
Picosecond lasers deliver very short pulses that can disrupt pigment with a strong photoacoustic effect. But “Pico” is a category, not one treatment: wavelength, pulse delivery, spot size, fluence, fractional optics, session spacing and accompanying care all change the result.
A 2026 meta-analysis of five small randomized trials found 755-nm picosecond alexandrite less effective than its topical comparator and associated with more PIH; the certainty was low. Earlier evidence was more encouraging for selected 1,064-nm protocols but highly heterogeneous, and an Asian split-face study found 1,064-nm Pico broadly comparable with Q-switched Nd:YAG rather than clearly superior. These are reasons for measured expectations, not a verdict that one machine always wins.
Why pigment can become darker
PIH is new pigment triggered by treatment-related inflammation or injury. Relapse means the original melasma pattern returns after improvement. Rebound hyperpigmentation means pigment worsens substantially after treatment, potentially beyond the previous level. Temporary crusting or darkening can occur when selected discrete lentigines are treated, but it does not prove that a spreading melasma flare is normal.
Risk is influenced by skin phototype, recent sun exposure, irritation, active inflammation, device parameters and aftercare. More richly pigmented skin can respond well to laser, but it also deserves conservative planning and strict light protection. “Less heat than older lasers” does not mean “zero pigment risk.”
What a careful plan should include
- A doctor confirms that the pattern is actually melasma
- The exact laser model, wavelength and mode are named
- Your skin phototype, previous PIH and recent sun or irritation history are considered
- Daily protection from ultraviolet and visible light is discussed
- Any topical or medical treatment is prescribed individually rather than copied from a package
- The clinic explains maintenance, relapse and what would make it pause treatment
This article does not provide a drug or laser regimen. Melasma treatment can involve prescription products and medical contraindications, so the plan belongs with a licensed doctor who has examined your skin.
Questions before buying a course
- What makes you confident this is melasma rather than another pigment condition?
- Which exact Pico device, wavelength and mode will you use — and why?
- What improvement is realistic, and over what follow-up period?
- What is my PIH risk, based on my skin and history?
- What is the plan if the pigment darkens or stops improving?
- How will results be photographed consistently rather than judged under different lighting?
When to contact a doctor
Contact the treating clinic promptly for blistering, marked swelling, severe pain, weeping skin, spreading redness, signs of infection, pronounced or spreading darkening, new mottled white or light patches, or eye or vision symptoms. Do not respond by adding stronger acids, bleaching products or another laser session on your own.
The bottom line
Pico laser can be useful for selected melasma cases, but the diagnosis and control plan matter more than the word “Pico.” Expect management rather than a permanent cure, ask for the exact wavelength and rationale, and be wary of any clinic that promises complete clearance without discussing relapse or PIH.