Laser Treatment for Melasma & Hyperpigmentation: What Actually Works

Pigmentation is one of the most common reasons patients seek aesthetic treatment, but “pigment” is not a single diagnosis. A discrete sun spot, diffuse photodamage, post-inflammatory hyperpigmentation, and melasma may all appear brown on the skin, yet they behave very differently when exposed to laser energy.

Successful treatment begins with identifying what the pigment is, where it is located, and how the patient's skin is likely to respond. From there, wavelength, pulse duration, fluence, spot size, and treatment strategy can be selected more intentionally.

Not All Pigment Behaves the Same

Superficial epidermal lesions such as freckles and solar lentigines often respond predictably because the excess melanin is relatively focal and accessible. Depending on skin type and lesion characteristics, these spots may be treated with wavelengths that are strongly absorbed by melanin.

Melasma requires a different approach. It is a chronic, relapsing pigmentary disorder with both epidermal and dermal involvement. Its biology is multifactorial, with ultraviolet and visible light exposure, hormonal influences, genetic susceptibility, vascular changes, and other dermal factors contributing to the condition.

That distinction matters. The goal with a lentigo may be efficient clearance of a discrete target. With melasma, the goal is controlled pigment reduction without provoking unnecessary inflammation or rebound pigmentation.

Why Melasma Requires a Different Laser Strategy

When treating melasma, more energy is not necessarily better.

Instead of attempting to aggressively clear pigment in a single treatment, laser therapy is typically approached conservatively and as one component of a broader management plan. Low-fluence 1064 nm Nd:YAG laser toning has been studied extensively for melasma and can produce improvement, but recurrence, rebound hyperpigmentation, and mottled hypopigmentation have also been reported — particularly with overly aggressive or repetitive treatment.

The 1064 nm wavelength is often selected because it penetrates more deeply and is less strongly absorbed by epidermal melanin than shorter wavelengths such as 532 nm. This can provide a wider therapeutic window in patients with more epidermal pigment or darker skin types, although appropriate patient selection and conservative parameters remain essential.

Q-Switched vs. Picosecond: Why Pulse Duration Matters

Wavelength determines where laser energy is absorbed, while pulse duration influences how that energy interacts with the pigment target.

Q-switched lasers deliver energy in extremely short nanosecond pulses. WONTECH's PASTELLE PRO is a Q-switched Nd:YAG system offering 1064 nm and 532 nm wavelengths for applications including pigment, toning, and tattoo removal.

Picosecond lasers shorten that pulse even further. As pulse duration decreases, pigment disruption relies increasingly on photoacoustic and photomechanical effects rather than prolonged thermal diffusion into surrounding tissue.

WONTECH's PICO MAJESTY delivers 250-picosecond pulses at both 1064 nm and 532 nm, allowing clinicians to combine wavelength selection with an ultra-short pulse duration when targeting pigment.

PICO ALEX adds a 755 nm Alexandrite picosecond platform, providing another wavelength option for selected pigmented lesions and tattoo ink.

Shorter pulse duration does not eliminate the importance of fluence. Rather, pulse duration, wavelength, fluence, spot size, and treatment endpoint work together to determine how selectively and safely pigment is treated.

Choosing the Right Wavelength

Different wavelengths provide different advantages:

• 532 nm has strong melanin absorption and is particularly useful for selected superficial epidermal pigment, especially in lighter skin types.
• 755 nm Alexandrite offers high melanin affinity with greater penetration than 532 nm and can be useful for selected epidermal and dermal pigment targets.
• 1064 nm Nd:YAG has comparatively lower melanin absorption and deeper penetration, making it particularly valuable when treating deeper pigment or patients in whom minimizing epidermal melanin absorption is important.
• Nanosecond and picosecond pulse durations allow pigment to be targeted with very short bursts of energy, with picosecond technology increasing the relative contribution of photoacoustic pigment fragmentation.

There is no universally “best” wavelength or pulse duration for pigmentation. The best choice depends on the diagnosis, pigment depth, skin type, treatment history, and desired endpoint.

Melasma Is Managed, Not Simply Cleared

This is perhaps the most important distinction between melasma and a discrete sun spot.

Laser treatment may help reduce visible pigment, but it does not eliminate the underlying tendency to develop melasma. Photoprotection remains foundational, including protection from both ultraviolet and visible light, and laser therapy is often most effective when incorporated into a broader plan that may include topical or systemic therapies when clinically appropriate.

For this reason, successful melasma treatment is usually measured by progressive improvement and long-term control, rather than attempting complete clearance in a single session.

Precision Over Power

Modern pigment treatment is less about choosing the most powerful laser and more about choosing the right wavelength, pulse duration, and treatment parameters for the pigment in front of you.

PASTELLE PRO, PICO MAJESTY, and PICO ALEX provide different wavelength and pulse-duration options within the WONTECH portfolio, allowing clinicians to individualize treatment rather than approaching every brown spot the same way.

WONTECH devices are intended for use by licensed medical professionals. Treatment selection, parameters, and suitability vary by patient, diagnosis, and skin type. Product availability, indications, and regulatory clearance may vary by market.