What melasma actually is
Most brown patches on the face behave the way you expect them to. They sit in the surface layers of skin, they arrived after years of sun, and the right laser will lift them reliably. The instinct to treat them with energy is sound, and for most pigment concerns it produces exactly the result a patient hopes for.
Melasma is the exception. It is not a sun spot. It tends to appear on the cheeks, the upper lip, and the forehead, and it looks, at first glance, like something a strong laser should erase. But it runs deeper than surface pigmentation, and it is driven by a combination of ultraviolet light, heat, and hormonal activity. That hormonal driver is why it is so common during pregnancy, on the oral contraceptive pill, and around perimenopause. It is also why it waxes and wanes rather than sitting still. Warm months, a course of hormones, a week in the sun, and the patch is back. That reactive quality is the thing that changes the treatment calculus entirely.
Understanding what drives pigmentation to return is the starting point for any honest conversation about melasma.
Why the wrong instinct is so common
The error is understandable. Melasma looks like something a laser should fix, and the laser is the tool most readily available in an aesthetic clinic. For the overwhelming majority of brown patches, reaching for energy is exactly right. The instinct is reliable almost everywhere else, which is precisely why melasma is the case worth knowing as the exception.
What happens in some patients when aggressive energy is applied to active melasma is this: the pigment-producing cells in the deeper layers, already primed and reactive from hormonal and thermal stimulation, respond to the trauma of laser energy with inflammation. That inflammation triggers more pigment production. The result is post-inflammatory hyperpigmentation, a rebound that can leave the patch darker and more resistant to treatment than it was before the session started. This is a longstanding caution in dermatology. It is not rare enough to dismiss and not certain enough to state as inevitable. The honest phrase is that it can happen, in some patients, and that knowing the risk changes how you approach the case.
A field that sells devices has a quiet structural incentive to laser everything, because the laser is the thing on the price list. Part of a doctor's job is protecting the patient from the tool when the tool is wrong for them. That is not a critique of any individual clinician. It is an observation about how incentives work in any industry where the product is also the answer.
What the evidence actually supports
The dermatology literature is consistent on this. Photoprotection comes first: a daily, high-factor sunscreen worn properly, every day, is not optional and is not the preamble to the real treatment. It is a significant part of the treatment itself, because every unprotected ultraviolet exposure is a stimulus to the same cells you are trying to settle.
Prescription topicals, chosen for the individual and the trigger pattern, are the next step. They work gradually, which is the honest version of how melasma management goes. Then, for some patients, conservative energy may have a role later in the plan, once triggers have been identified and managed and the patch has been properly assessed. Energy is not excluded from a melasma protocol. It is placed correctly within it, never used as the opening move on a patch that has not been examined.
The correct answer is the slow one. That is exactly why it is the one most likely to be skipped. A patient who is told that melasma can be treated in a single aggressive session has been promised more than the technology can deliver, and the consequence of that promise, when it goes wrong, is a darker and harder patch than the one she arrived with.
Melasma is managed rather than cured. Setting that expectation honestly at the start is not a limitation of the consultation. It is the consultation.
What a careful clinician does with a suspected melasma
The first step is reading it properly. Melasma and a sun spot can look similar to the untrained eye, but they behave differently and they require different approaches. A clinician who does not ask about sun exposure, heat triggers, pregnancy history, current or recent contraceptive use, or when the patch first appeared and whether it fluctuates, is missing the information that determines the plan.
Energy, if it appears at all, comes later in the plan and at conservative settings, not as the first-line response to a brown patch on a face that has not been assessed. The patient is told clearly that this is a long-term management conversation, that recurrence is common when triggers remain, and that a good outcome means a controlled patch rather than a cleared one.
There is one question a patient can ask before any laser session on a pigmented patch: have you taken my trigger history? Sun, heat, hormones, the last time it flared, what made it worse. If the answer is no, that is the moment to pause. A plan built without that information is a plan built without the diagnosis. The laser may be the right tool for the person sitting in the chair next to you and the wrong one for you, even if your patches look the same in the waiting room.
The concern page on pigmentation gives a broader picture of how different causes call for different approaches. And for a comparison with sun spots, which do respond reliably to the right laser, this piece on age spots is useful context.
