Melasma Laser Treatment: Settings, Sessions and Rebound Risk

Laser can lighten melasma but does not cure it. Low-fluence Q-switched or picosecond 1064 nm toning is the most used approach, given gently over a course alongside sunscreen, topical care and sometimes oral tranexamic acid. Settings stay low because excess heat can cause rebound darkening or pale, mottled spots. Melasma tends to return without maintenance.

Can laser treat melasma?

Yes, but only as one part of a plan. Melasma is more than extra pigment. The pigment cells are overactive, and the skin around them shows signs of chronic sun damage: more blood vessels, changes in the dermis and a weakened basement membrane that lets pigment drop deeper. Hormones, UV, visible light and heat keep driving the process. Researchers increasingly describe melasma as a photoaging disorder, which explains why it relapses so readily.

A laser can break up pigment that has already been made. It cannot switch off the signals that make more. That is why laser alone gives short-lived results in melasma, and why treatment that is too aggressive can add a new driver, inflammation, to the list. The base of every melasma plan is daily protection from UV and visible light, usually with a tinted, iron-oxide sunscreen, plus topical treatment and, where medically suitable, oral tranexamic acid, a prescription medicine. Laser is added to speed lightening and is kept deliberately gentle. The medical side is set out on melasma treatment, and the options are compared in melasma: laser vs tranexamic acid vs skincare.

Which lasers are used for melasma?

Low-fluence 1064 nm Q-switched Nd:YAG, often called laser toning, is the most widely studied and used approach in Asian skin. The long wavelength passes through the surface with little absorption by surface melanin and fragments pigment in the epidermis and upper dermis a little at a time. Picosecond lasers at 1064 nm or 785 nm can do a similar job with less heat per pulse, and fractional picosecond delivery has been studied in dermal and mixed melasma. Non-ablative fractional lasers are sometimes used at very low density, mainly in research settings, because the heat they deposit is the very thing melasma reacts to.

Why do melasma laser settings stay low?

In melasma the aim of each session is to remove a small amount of pigment without provoking the skin. Three settings matter most. Fluence, the energy per area, is kept low. Spot size is kept large, so the energy is spread evenly and reaches slightly deeper without hot spots. The endpoint is mild, even pinkness at the end of the session. Whitening of the skin, pinpoint bleeding or obvious swelling are signs that the energy is too high for melasma.

The number of passes and the overlap between them also count, because total heat builds up with every pass. In skin that reddens easily or has visible vessels, energy is reduced further. These are clinical judgements made in the session, by looking at how your skin responds to each pass, which is why melasma laser is performed by the doctor rather than delivered as a fixed recipe.

Preparation counts as much as the settings. Laser is usually started only after several weeks of consistent protection from UV and visible light and topical care, so that the pigment cells are calmer when the first session takes place. Skin that is irritated, sunburnt, recently tanned or reacting to a new product is not treated that day. Prescription topical treatments, if used, may be paused for a few days around each session to avoid irritation. A first session at conservative settings, reviewed a few weeks later, shows how your skin behaves before the course continues. This slower start often saves time overall, because a rebound early in a course can set progress back by months.

How many melasma laser sessions are needed, and how far apart?

Published toning protocols in Asian skin commonly use a course of around five to ten sessions, spaced one to four weeks apart. At IN Eternity Clinic the spacing is usually at the longer end, because melasma that is treated too often is more likely to rebound or develop pale spots. Progress is checked with photographs in standard lighting every few sessions. If the melasma is lightening, intervals may lengthen; if it is darkening or the skin is reacting, laser is paused and the medical side of the plan is strengthened.

Once the melasma has lightened, the plan moves to maintenance: strict sun and heat protection, topical care and, for some people, an occasional gentle session. The honest expectation is control rather than clearance. Most people see melasma return to some degree with sun, heat, pregnancy or hormonal change, which is why maintenance is planned from the start.

How are rebound darkening and pale spots avoided?

Rebound hyperpigmentation is darkening that appears after laser, sometimes worse than the starting point. It follows inflammation: heat and injury activate pigment cells, and melasma-prone skin responds strongly. It is more likely after high energy, many passes, short intervals, sun exposure soon after treatment or irritation from strong skincare.

Mottled hypopigmentation is the opposite: small pale or white spots, sometimes called confetti-like, that appear after repeated toning sessions at high cumulative dose. A published case series from Hong Kong described this after frequent low-fluence 1064 nm treatments. It can be slow to recover and sometimes does not, which is why the number and frequency of sessions are capped and the skin is examined before every session.

Risk is reduced in several ways. The diagnosis is confirmed first, since Hori’s naevus or sun spots mixed in with melasma need different handling. Skin is prepared with sun protection and topical care for some weeks before laser starts. Energy is kept low and sessions are spaced out. Heat exposure, including hot yoga, saunas and cooking close to heat, is limited during treatment. And at the first sign of darkening or pale spots, laser is stopped rather than pushed harder.

How is melasma laser planned at IN Eternity Clinic?

Dr Sin Yong examines the pigment pattern under magnification, asks about hormones, medicines, sun and heat, and checks for other pigment types. Standard photographs are taken. Medical care and protection start first. Where laser is added, it is usually low-fluence 1064 nm toning on the DEKA TORO, or gentle picosecond work, at settings chosen for your skin type and spaced conservatively. Oral tranexamic acid is considered only after a review of clotting risk and other medicines.

If laser is not appropriate for your melasma, you will be told so. More background is on the melasma condition page, in the melasma guide and on pico laser Singapore.

Common myths, answered

• Myth: A stronger laser clears melasma faster.
  Fact: Higher energy is the most common cause of rebound darkening and pale spots in melasma. Gentle, spaced sessions are safer.
• Myth: Melasma can be removed for good with laser.
  Fact: Melasma is chronic. Laser can lighten it, but it tends to return with sun, heat or hormonal change without maintenance.
• Myth: Pico laser cannot cause rebound.
  Fact: Picosecond pulses carry less heat, but too much energy or too many sessions can still inflame the skin and darken melasma.
• Myth: Sunscreen is enough on its own.
  Fact: Standard sunscreen does little against visible light. A tinted, iron-oxide product, shade and heat avoidance are part of the plan.