Pigment laser and brown spots: the complete guide to choosing and successfully completing your treatment (2026)

1 Brown spots, a common but complex enemy

A brown spot isn't simply an excess of color on the surface. It's the visible sign of a local overproduction of melanin—the skin's natural pigment—by cells called melanocytes . This overproduction can be triggered by the sun, hormones, inflammation, or simply cellular aging. Understanding the origin of a spot is already half the battle.

Topical active ingredients—hydroquinone, vitamin C, azelaic acid, retinoids—work by inhibiting melanin production or accelerating cell renewal. They are effective for prevention and maintenance, but their penetration is limited when pigmentation is deeply embedded. This is where lasers come in: by selectively targeting the pigment in the affected layers, they can achieve results that no cream can match.

Choosing the right laser for the right type of spot and skin type is crucial. An unsuitable treatment can worsen hyperpigmentation, cause depigmentation, or, in the case of melasma, trigger a severe rebound. That's why this article doesn't just present the technologies; it emphasizes diagnosis as the foundational step for any successful treatment.

2 Understanding brown spots: diagnosis is key.

Not all brown spots look alike, and they are not all treated the same way. The first step—which is non-negotiable—is a medical examination by a dermatologist or qualified physician, equipped with a dermatoscope, before any treatment decision is made. This examination allows the doctor to identify the exact nature of the lesion, assess its depth within the skin, and rule out a suspicious lesion such as melanoma.

The main types of brown spots

Solar lentigines — often called "age spots"—are the most common. They appear on areas exposed to the sun: face, hands, chest, and forearms. They are epidermal (superficial), well-defined, and respond exceptionally well to laser treatment. This is the area where the results are most predictable and long-lasting.

Freckles are genetically determined, fade in winter, and reappear in the sun. They can be lightened with laser treatment, but recurrence is inevitable without strict sun protection. Melasma , or the mask of pregnancy, is the most complex form: hormone-dependent, often mixed (epidermal and dermal), and particularly prone to rebound. It deserves a dedicated section in this guide.

Post-inflammatory hyperpigmentation ( PIH) occurs after skin irritation—acne, eczema, injury, or a poorly performed cosmetic procedure. Seborrheic keratoses are benign, often rough lesions, frequently mistaken for spots but requiring a different laser treatment. Finally, poikiloderma of Civatte affects the neck and décolleté with a characteristic mottled appearance linked to photoaging.

The depth of the stain: a decisive factor

An epidermal lesion is located in the superficial layers of the skin. It responds better and faster to laser treatment. A dermal lesion is deeper, more difficult to reach, and carries a higher risk of adverse effects. A mixed lesion—like melasma in its most common form—combines both levels and requires a layered approach. Wood's lamps and dermoscopy allow for the assessment of this depth before any treatment.

3 How does pigment laser work?

Pigment laser treatment is based on the principle of selective photothermolysis : a chosen wavelength is preferentially absorbed by melanin, the pigment target, without damaging surrounding tissues. The absorbed energy causes thermal or mechanical destruction of melanosomes —the cellular organelles where melanin is stored—which fragment into microparticles.

These particles are then eliminated by the skin's immune cells (phagocytosis) and gradually shed. This is why the result of pigment laser treatment is not immediate: it develops over several weeks after the session, at the rate of the natural elimination of the destroyed pigment. On lentigines, this phenomenon often manifests as a temporary darkening of the spot, followed by the formation of a thin scab that falls off within a few days—a sign that the treatment has been successful.

Wavelength is the fundamental parameter : each laser emits at a specific wavelength, which determines the depth of penetration into the skin and its selectivity for melanin. Fluence ( energy per cm²) and pulse duration determine the intensity of the thermal effect. A properly configured laser maximizes effectiveness while minimizing the risk of damaging healthy tissue.

4 Available laser technologies

The landscape of pigment lasers has changed considerably in recent years. Two main families coexist, with complementary indications.

The Q-Switched Laser

The Q-switched laser delivers very short (nanosecond) pulses of high energy. It is available in several wavelengths: the 1064 nm Nd:YAG penetrates deeper and is suitable for dermal blemishes and darker skin tones; the 532 nm Nd:YAG (KTP) targets superficial blemishes on light skin; the 755 nm Alexandrite is very effective on lentigines and freckles. The 694 nm Ruby completes this range for treating epidermal pigmentation. This has been the gold standard technology for several decades, with excellent clinical experience in treating solar lentigines.

The picosecond laser

The picosecond laser —whose reference devices include PicoSure, PicoWay, and Enlighten—delivers pulses a thousand times shorter than Q-switched lasers (picoseconds vs. nanoseconds). The effect is more mechanical than thermal: the pigment is fragmented into finer particles, with less residual heat. Recovery time is often reduced, and the risk of post-inflammatory hyperpigmentation is lower, making it the technology of choice for complex cases: melasma, hyperpigmentation, and dark skin. By 2026, the picosecond laser had become the gold standard for challenging skin profiles.

IPL and fractional CO2 laser

Intense pulsed light ( IPL ) is not strictly speaking a laser: it emits a broad, less selective spectrum. It can be useful on superficial lentigines in fair skin, but it is strongly discouraged in cases of melasma—the risk of rebound is real. Fractional CO2 lasers are ablative: they work by remodeling the skin overall rather than by directly targeting pigment. They can be combined with a pigment laser for thick lentigines or seborrheic keratoses, but their use on darker skin requires great caution.

Comparative table of technologies

Table: Spot type × Recommended laser × Prognosis

5 Melasma: the most complex case

Melasma deserves special attention, as its treatment differs significantly from other hyperpigmentation conditions. It is a hormone-dependent condition —often triggered by pregnancy, oral contraceptives, or sun exposure—that primarily affects women with medium to high skin tones. It manifests as symmetrical brown spots on the face, particularly on the forehead, cheeks, and upper lip.

Its complexity stems from its mixed nature: the pigment is often present in both the epidermis and the dermis, and the melanocytes involved are hyperreactive. Any source of heat or inflammation—including a poorly calibrated laser—can trigger a rebound effect , where the skin produces even more melanin in reaction to the irritation. This is why melasma was long considered a relative contraindication to laser treatment.

Current protocols have evolved. By 2026, low-fluence picosecond lasers and LADD (Low Fluence Q-Switched) protocols were the consensus choice for melasma: they allow treatment of the pigment without triggering the inflammatory reaction that promotes rebound. These approaches are always combined with topical treatment (tranexamic acid, mild depigmenting agents) and absolutely strict SPF 50+ sun protection. Without the latter, no laser treatment for melasma is effective in the long term.

It is essential to be honest with patients suffering from melasma: it is not permanently curable. It is managed over the long term, with regular maintenance protocols, constant sun protection, and therapeutic adjustments to hormonal fluctuations.

6 Phototypes and blemishes: adapting the treatment to each skin type

Phototype —defined by the Fitzpatrick scale in six levels, from lightest (I) to darkest (VI)—is the first parameter assessed before any pigment laser treatment. It determines the level of basal melanin in the skin, and therefore the risk of confusion between the therapeutic target (the spot) and the skin's underlying pigmentation.

Skin types I to III (fair to slightly dark skin) are the best candidates for pigment laser treatment. The contrast between the pigmentation and healthy skin is maximized, the laser's selectivity is optimal, and the risk of side effects is minimized. Results on solar lentigines are often spectacular after just one session.

Skin types IV to V (medium to dark skin) can be treated, but with increased caution. The main risk is post-inflammatory hyperpigmentation : the skin reacts to the laser treatment by producing more melanin, which can create a spot more visible than the one intended to be treated. Picosecond lasers, reduced fluences, and prior depigmenting preparation (4 to 6 weeks) help minimize this risk. Skin type VI is a very restrictive indication, reserved for highly specific protocols with rigorous medical supervision.

7 Choosing your healthcare provider in Switzerland

In Switzerland, the use of medical lasers for cosmetic purposes is regulated by Swissmedic and cantonal regulations concerning medical practice. Class IV pigment lasers are medical devices whose use is restricted to physicians or authorized healthcare professionals under medical supervision. Regulations vary from canton to canton; therefore, it is important to verify your practitioner's accreditation.

The ideal practitioner for treating brown spots is a dermatologist or a physician specializing in aesthetic medicine, specifically trained in laser therapy and equipped with multiple technologies in their practice. The initial consultation should always include a complete skin assessment, dermoscopy of the lesions, phototype determination, and a patch test if necessary.

Certain signs should raise concern: lack of prior medical consultation, treatment offered without examination of the lesion, non-medical personnel operating a Class IV laser, or promises of guaranteed results in a single session regardless of the nature of the spot. Medical tourism for pigment laser treatment presents specific risks: in case of complications (rebound, depigmentation), follow-up is difficult, if not impossible.

8 Process, results and risks

What happens during a session

The session begins with cleansing the area to be treated, followed by the application of appropriate eye protection. The practitioner adjusts the laser settings according to the type of blemish, skin type, and area. A patch test on a small area may be performed during the first session. The sensation varies depending on the technology: intense heat, slight pricking, or even a sharp popping sound with the Q-switched laser. The duration ranges from fifteen minutes for a small area to one hour for extensive treatment of the face and hands.

After the session, immediate effects include redness, slight swelling, and, in the case of lentigines, a characteristic darkening of the spot. In the following days, a thin scab forms and falls off spontaneously—it is essential not to pick at it. Makeup can usually be applied after 5 to 10 days, depending on the laser used. Sunscreen with SPF 50+ is mandatory starting the day after treatment and for the following weeks.

Results and sustainability

Solar lentigines respond dramatically to laser treatment, often after just one session. The results are very long-lasting if sun protection is maintained. Freckles fade well but tend to recur with sun exposure. Hyperpigmentation (HPI ) responds variably depending on the depth of the lesion and skin type. Melasma improves with the right protocols, but maintenance sessions are necessary in the long term. Hair reduction is often 70 to 90% after a complete course of treatment, depending on the type of lesions.

Risks and contraindications

In a rigorous medical setting, pigment laser treatment has a favorable safety profile. The most frequent side effects are transient: redness, sensitivity, and scabbing. Post-inflammatory hyperpigmentation is the main risk, especially in individuals with darker skin tones—it is largely predictable and avoidable with proper preparation. Depigmentation (hypopigmentation) is rare but possible, particularly in cases of excessive fluence. Melasma rebound is a real risk if the technology or fluence is inappropriate.

Absolute contraindications include recent sun exposure or active tanning, pregnancy, use of photosensitizing medications (certain antibiotics, oral retinoids, amiodarone), and any undiagnosed, suspicious pigmented lesion. Relative contraindications include a history of keloids, recent shingles in the area to be treated, and certain active skin diseases.

9 Complementary treatments and prevention

Pigment laser treatment is not the only option in a well-conducted protocol. Depigmenting chemical peels —with glycolic, kojic, or tranexamic acid—are excellent maintenance treatments between laser sessions, or an alternative for those who cannot benefit from laser treatment. Microneedling , combined with depigmenting agents, can be a useful complement for mild hyperpigmentation, but must be used with caution on darker skin tones.

Topical active ingredients play a fundamental role both before and after laser treatment. Oral or topical tranexamic acid is particularly promising for melasma. Vitamin C and retinoids, used for maintenance, slow melanogenesis and accelerate cell renewal. These active ingredients do not replace laser treatment for established spots, but they prolong its results.

Prevention remains the most cost-effective investment. Daily sun protection with SPF 50+—applied correctly and reapplied every two hours when exposed to the sun—is the only measure that will preserve the results of laser treatment and slow the appearance of new spots. Dietary antioxidants (polyphenols, vitamin C, omega-3 fatty acids) and stress management (cortisol stimulates melanogenesis) complement this preventative approach. No laser treatment, however effective, can be sustained without this daily discipline.

A successful treatment is always a personalized one: the right laser, on the right type of spot, for the right skin type, with the right follow-up care. The skin has its own rules—respecting them is the key to any lasting result.