Pigmentation and Uneven Skin Tone

Key Takeaways

Uneven skin tone occurs when melanin production, distribution or clearance becomes uneven. Common triggers include ultraviolet exposure, visible light, hormonal influences, inflammation, skin injury, irritation, some medications and underlying pigmentary disorders. More than one factor can be present at the same time.[1][3][7][8]

Sun and visible light are especially relevant to melasma. Ultraviolet exposure can deepen existing pigmentation, while visible light can also worsen melasma, particularly in darker skin tones. That is why treatment is not simply about removing pigment that is already visible. The plan also needs to reduce the factors that continue to stimulate pigmentation.[1][2]

PIH is different in that the pigmentation follows inflammation or injury. Acne, eczema, irritation, burns, picking and procedures can all trigger it. If the original inflammation continues, or the skin is repeatedly irritated, new pigment can continue to appear.[3][7]

Several common conditions can produce brown or grey-brown patches, but they should not automatically be treated in the same way.

Melasma

Melasma usually appears as fairly symmetric brown or grey-brown patches on areas such as the cheeks, forehead, nose or upper lip. It can involve epidermal, dermal or mixed pigment and is influenced by light exposure, hormonal factors and other triggers. Because it tends to recur, long-term management is usually more realistic than a one-time procedure.[1][8]

Post-Inflammatory Hyperpigmentation

PIH develops after inflammation or injury, commonly after acne or dermatitis but also after irritation or procedures. The key clinical question is often what caused the inflammation in the first place. If that trigger is not controlled, treating the colour alone may not solve the problem.[3][7]

Solar Lentigines and Freckles

Solar lentigines are usually flat, sharply defined brown lesions associated with cumulative sun exposure. Freckles are small pigmented macules strongly influenced by genetics and sun exposure. Other causes of pigmentation include drug-related pigmentation and other inflammatory or lichenoid disorders. A changing or atypical lesion should be medically assessed before cosmetic treatment.[5][6][7]

A laser that is useful for one pigmentary condition may be ineffective or counterproductive for another. Assessment should consider the pattern, symmetry, colour, borders and distribution of the pigmentation, together with sun exposure, hormones, medications, inflammation, skincare and previous procedures. Dermoscopy can add useful information, and biopsy may be appropriate when a lesion is atypical or the diagnosis is uncertain.[1][5][8]

Melasma can also have vascular and pigmentary components. This is one reason the same-looking brown patch does not always respond to a purely pigment-targeting strategy. Reviews of laser and light treatments describe several possible approaches, but also emphasise cautious treatment because procedure-related inflammation may worsen pigmentation and recurrence is common.[12][21]

The practical principle is simple: assess the problem first, then select the technology. This is particularly important when the patient has a history of PIH or darker skin, where unnecessary inflammation can create another pigmentation problem.

Treatment usually begins with trigger control and light protection. Depending on the diagnosis, a clinician may also use topical therapy, laser or light procedures, RF microneedling, or a combination. The device should serve a defined clinical objective rather than determine the diagnosis.[1][2][3][4]

Named Technologies Used in the Discussion

ADVATx Yellow Laser

ADVATx is a dual-wavelength laser platform using 589 nm and 1319 nm wavelengths. Manufacturer and Malaysian distributor information describe pigmentation and melasma among its intended or promoted applications. Those device claims should be distinguished from independent clinical evidence. The Malaysian Medical Device Register lists an ADVATx registration under Luvida Medical that is valid through 19 June 2029 as of the current record.[18][19][20]

MIIN Nd:YAG Laser

MIIN is a Q-switched Nd:YAG laser platform with 1064 nm and 532 nm wavelengths. Evidence for melasma should be matched to the exact wavelength, pulse mode and protocol used, rather than inferred from the brand name alone. A Malaysian registration for a Q-switched Nd:YAG laser system held by Luvida does not, by itself, establish that a particular clinic's MIIN unit is that registered device.[9][10][20][22]

Sylfirm X

Sylfirm X is a dual-wave RF microneedling system with pulsed-wave and continuous-wave modes. Its manufacturer and distributor materials describe pulsed-wave use for melasma and PIH, while the wider RF microneedling evidence base is still developing. A 2026 systematic review found improvement across included melasma studies but noted clinical and methodological heterogeneity, so device-specific claims should not be treated as proof that every RF microneedling protocol will perform the same way.[14][15][16]

Malaysia regulatory context: the Malaysian Medical Device Register currently lists a Sylfirm X system, with the registration record valid through 8 November 2026. The listed intended purpose in that record is electrocoagulation and haemostasis. Registration therefore should not be presented as proof of a melasma indication or of clinical superiority.[17]

Skin type is an important part of treatment planning because more deeply pigmented skin can be more prone to PIH after inflammation or energy-based procedures. This does not mean that lasers or RF microneedling are automatically unsuitable. It means that diagnosis, wavelength, energy, treatment density, previous PIH and the patient's tanning response need to be considered together.[3][13][21]

The AAD recommends broad-spectrum, water-resistant SPF 30 or higher. For melasma and darker skin, tinted sunscreen containing iron oxides can add protection against visible light. Gentle skincare is also relevant because ongoing irritation can perpetuate PIH.[2][3]

Factors that can raise the risk of unwanted pigmentation include a previous history of PIH, darker phototypes or strong tanning response, excessive treatment intensity, repeated irritation and inadequate light protection. The goal is not simply to use the strongest treatment available. The goal is to deliver enough treatment for the intended objective while limiting unnecessary inflammation.[3][13][21]

Pigmentation can return after treatment, especially when the underlying condition is chronic or the trigger remains active. Melasma is the clearest example. A procedure can reduce visible pigment without removing the skin's tendency to produce excess melanin in response to light, hormones or inflammation.[1][12]

Long-term studies of low-fluence 1064-nm Q-switched Nd:YAG illustrate the point. One Asian study reported recurrence in all patients during follow-up. Another long-term study found recurrence in 20 of 34 patients, or 58.8%, one year after treatment. A separate 2025 retrospective study using three 1064-nm treatment modes reported an 18.6% recurrence rate at 12 months. These are study-specific results, not a universal recurrence rate for every laser or every patient.[9][10][11]

A realistic plan therefore includes maintenance. Consistent light protection, appropriate ongoing treatment, control of inflammatory triggers and reassessment of unexpected or changing pigmentation are usually more useful than repeatedly escalating treatment intensity.[1][2][3][5]

• What is the most likely diagnosis, and what makes you think that?
• Is the pigment mainly epidermal, dermal or mixed, and does that change the treatment plan?
• Is the goal to reduce pigment, control inflammation, address a vascular component, or improve overall skin tone?
• Why is this particular device or wavelength being selected for my skin and diagnosis?
• What is the evidence for this exact device and protocol, rather than for the treatment category in general?
• What is my risk of PIH or hypopigmentation, and how will that risk be reduced?
• What maintenance treatment and light-protection plan will I need after the procedure?
• If the pigmentation changes or becomes atypical, should it be reassessed before treatment continues?

Pigmentation treatment should begin with a diagnosis, not a device. Melasma, PIH, solar lentigines, freckles and other pigmentary conditions can look similar but have different causes, treatment responses and risks. This matters even more when the skin is prone to PIH, because an overly inflammatory treatment can create another pigmentation problem.[1][3][5][13]

The practical next step is to have the pigmentation assessed before choosing a procedure. Ask what diagnosis is being treated, why the proposed technology fits that diagnosis and your skin, what evidence supports the exact device and protocol, and how recurrence or PIH will be managed. Technology should follow clinical reasoning, not replace it.