The clinical approach
Light-based treatment works on a principle called selective photothermolysis, described by Anderson and Parrish in 1983. A laser fires a single, tightly defined wavelength. That beam gets absorbed by a specific target in the skin, and for pigment that target is melanin. Because the light is monochromatic, it can heat the pigment while leaving surrounding tissue largely alone. Our engineering archive puts it plainly: it is exactly this single-wavelength quality that makes selective targeting possible.
Wavelength decides how deep the energy reaches. Shorter light around 532nm is absorbed strongly near the surface, which suits epidermal pigment. Longer 1064nm light travels deeper and can reach the dermal melanin that gives melasma its stubborn, cloudy look. That depth is the whole reason 1064nm Q-switched Nd:YAG sits at the center of melasma work.
The catch is dose. Melasma punishes aggressive settings. Hit it hard and you risk rebound darkening or post-inflammatory hyperpigmentation. So the accepted approach is low-fluence 1064nm laser toning: gentle passes with a large spot, repeated across many sessions, nudging the pigment down instead of blasting it. You are coaxing melanocytes to calm down, not burning pigment out in one go.
Treatment protocol
A realistic course runs long. Plan for something like six to ten toning sessions, spaced roughly one to two weeks apart, then reassess. Some clients need maintenance passes after that to hold the result. Tell people this up front so nobody expects a single visit to fix years of pigment.
Always run a test patch first. Treat a small area, around half a centimetre to a centimetre, and watch the response over several days. Some patients flare with obvious pigmentation that only settles later, and a test spot tells you whether to continue or switch to topical management instead. This trial step has been standard practice in our device manuals for years.
- Keep fluence low and the spot large. Chasing instant clearing is how you cause harm.
- Aftercare is non-negotiable: broad-spectrum sunscreen daily, strict sun avoidance, and gentle skincare. Sun undoes the work faster than the laser fixes it.
- Combine sensibly. Toning pairs well with topical agents and good photoprotection for a durable outcome.
- Be extra cautious with darker skin types. More epidermal melanin means more competing absorption and a higher risk of burns and post-inflammatory hyperpigmentation. If that risk shows up, read our guidance on post-inflammatory hyperpigmentation before your next pass.
Set expectations honestly. Melasma tends to lighten gradually and can recur with sun or hormones. This is professional equipment for trained operators, and outcomes depend on the hand running the machine.
Recommended equipment
For melasma, the workhorse is a Q-switched Nd:YAG platform delivering 1064nm energy in short pulses, with a large spot and low-fluence toning mode. Our QN-03 Q-Switched Nd:YAG is built for exactly this: the 1064nm wavelength reaches dermal pigment, and controllable low-energy toning lets an operator work conservatively across repeat sessions. The specification table on the product page lists the exact parameters, so match settings to the manual rather than guessing.
The same platform handles the pigment removal and rejuvenation work a busy clinic needs alongside melasma, which makes it a practical single investment. Whichever system you choose, the discipline matters more than the badge: low fluence, a proper test patch, and patient sun protection separate a good melasma result from a PIH complaint.
Frequently asked questions
Can melasma be cured permanently with laser?
No, and be wary of anyone who claims it can. Melasma is chronic and recurrence-prone. Low-fluence 1064nm toning can lighten the patches noticeably and keep them under control, but hormones and sun exposure can bring pigment back. Think of it as ongoing management with maintenance sessions, not a one-time erase. Honest expectations protect both your client and your clinic.
Why use low fluence instead of stronger settings for faster results?
Because melasma reacts badly to aggressive energy. High fluence can trigger rebound darkening or post-inflammatory hyperpigmentation, leaving skin worse than before. Gentle, repeated toning passes coax the pigment down safely. It is slower, but it is the difference between a happy repeat client and a complication you have to fix.
Is melasma treatment safe for darker skin?
It can be, with caution. Darker skin holds more epidermal melanin, which competes for the laser energy and raises the risk of burns and post-inflammatory hyperpigmentation. Use conservative settings, run a test patch first, and space sessions generously. Any operator working on Fitzpatrick IV to VI skin should be experienced and watch closely for early signs of irritation.
What aftercare matters most?
Sun protection, without question. Daily broad-spectrum sunscreen and genuine sun avoidance do more to hold your results than anything else. Pair that with gentle skincare and, where appropriate, topical pigment agents between sessions. Skip the photoprotection and the pigment returns quickly, no matter how careful the laser work was.