The Melasma Laser Trap: Why the Most Requested Fix Is Often the Wrong First Move

Walk into almost any laser practice in Beverly Hills and one of the most common requests is the same: erase melasma with a laser. The pigment looks superficial, lasers remove pigment, so the logic feels obvious. The problem is that melasma is not a stain sitting on the skin. It is a chronic, relapsing condition driven by overactive melanocytes, and lasers can provoke those cells as easily as they can quiet them.

The myth: melasma is just pigment, and lasers remove pigment. Sunspots and melasma can look similar to the eye, but they behave very differently under a laser. A solar lentigo is a discrete deposit of melanin with relatively stable biology. Melasma involves melanocytes that are hyperresponsive to ultraviolet light, visible light, heat, hormones, and inflammation. The condition also frequently includes a vascular component, with increased small blood vessels in affected skin that appear to signal melanocytes to keep producing pigment. For an independent overview, see Melasma and pigmentation: diagnosis and treatment.

Why heat is the enemy. Most pigment lasers work through selective photothermolysis: the laser pulse is absorbed by melanin, converted to heat, and that heat fragments the pigment. In a sunspot, that is the end of the story. In melasma, the same heat acts as an inflammatory trigger. Inflamed skin releases signaling molecules, including endothelin-1 and stem cell factor, that tell melanocytes to increase production. The result is a familiar and frustrating pattern reported across published case series: the patch lightens for four to eight weeks, then returns darker than baseline. Clinicians call this rebound hyperpigmentation, and it is more likely in Fitzpatrick skin types III to VI, which describes a large share of the Los Angeles patient population.

What the evidence actually supports. When lasers are used for melasma in the peer-reviewed literature, the approach that performs best is deliberately gentle. Low-fluence Q-switched or picosecond Nd:YAG at 1064 nanometers, sometimes called laser toning, uses many low-energy passes to fragment pigment while trying to stay below the inflammation threshold. Even this technique carries documented risks with repeated sessions, including punctate hypopigmentation, small white spots that can be permanent. Nonablative fractional lasers at conservative densities have shown modest benefit in some studies, but recurrence within months is the norm rather than the exception when the laser is used alone. High-energy ablative resurfacing and intense pulsed light at aggressive settings are the modalities most consistently associated with worsening.

The sequence that clinicians actually follow. Board-certified dermatologists who publish on melasma tend to describe a pyramid, and the laser sits near the top, not the bottom. The foundation is strict photoprotection, and for melasma that means tinted mineral sunscreen containing iron oxides, because visible light, not just ultraviolet, stimulates pigment in darker skin types. The next layer is topical therapy: hydroquinone in supervised courses, or combinations built around tretinoin, azelaic acid, and kojic acid. Oral tranexamic acid, prescribed off-label in appropriate candidates after screening for clotting risk, has become a significant tool because it addresses the vascular signaling component that lasers cannot safely reach. Chemical peels at superficial depths sit in the middle. Lasers enter the picture for pigment that persists after this groundwork, and only at conservative settings, often while the patient continues topical therapy to suppress rebound.

Questions worth asking at a consultation. First, has the diagnosis been confirmed? Melasma, post-inflammatory hyperpigmentation, and lentigines require different plans, and a Wood's lamp or dermoscopic exam helps distinguish depth and type. Second, what is the plan before the laser? A practice that proposes laser as the first and only intervention for melasma is departing from the published standard of care. Third, what is the plan for recurrence? Melasma is managed, not cured. Any honest treatment plan includes maintenance, usually topical, and an expectation that summer sun exposure can undo months of progress. Fourth, has a test spot been offered? A small treated area observed for several weeks is a low-cost way to identify a rebound-prone patient before committing the full face.

The bottom line. Lasers have a real, evidence-supported role in melasma, but it is a supporting role: low energy, conservative settings, layered on top of photoprotection and topical or oral therapy. The devices most heavily marketed for facial rejuvenation, aggressive IPL and high-energy resurfacing, are the ones most likely to make melasma worse. In a market as saturated with laser platforms as Beverly Hills, the most valuable thing a patient can hear at a melasma consultation may be a version of not yet. That restraint is not a lack of technology. It is the technology being used the way the evidence says it should be.