A labelled comparison. IN Eternity Clinic does not offer yellow laser. Dr Sin Yong explains how it differs from pico and toning, and what is used for redness here instead.
WhatsApp to Enquire →Key facts ↓Yellow laser (577–578 nm) mainly targets small blood vessels, so it is used for redness, fine vessels and red acne marks. Pico laser breaks up pigment with very short pulses, and laser toning evens tone gently over a course. IN Eternity Clinic does not offer yellow laser; redness is treated here with the 675 nm 少女光 laser and medical care, and pigment with pico or toning.
“Yellow laser” is the name used for lasers that emit yellow light at about 577 to 578 nm. Two kinds are common: copper bromide lasers at 578 nm, often paired with a 511 nm green beam, and optically pumped semiconductor lasers at 577 nm. In Singapore they are promoted for facial redness, rosacea, fine visible vessels, red acne marks and a brighter “glow”, and sometimes for melasma.
People searching for yellow laser are usually choosing between several “glow” lasers, and the two they meet most often are pico laser and laser toning. The three are not versions of the same thing. They aim at different targets in the skin, so the useful question is not which is stronger but which target your skin actually needs treated.
All three rely on selective photothermolysis: light of a chosen wavelength is absorbed by a particular target, and the pulse is timed to affect that target while sparing the tissue around it. What differs is the target.
Put simply: yellow laser is a vessel laser that also touches pigment; pico and toning are pigment lasers that do little for vessels.
| Yellow laser | Pico laser | Laser toning | |
|---|---|---|---|
| Main target | Small blood vessels (oxyhaemoglobin) | Pigment (melanin), tattoo ink | Pigment, gently and evenly |
| Wavelength | 577–578 nm (some add 511 nm) | Commonly 1064, 532 or 755 nm | 1064 nm Nd:YAG |
| Pulse | Longer pulses to heat vessels | Picoseconds, mainly photoacoustic | Nanoseconds at low fluence |
| Usually used for | Redness, fine vessels, red acne marks | Sun spots, freckles, some dermal pigment, acne marks | Dull, uneven tone; part of melasma care |
| Less suited to | Brown pigment alone; tanned skin | Redness and vessels | Redness and vessels; discrete spots |
| Typical course | A few sessions, weeks apart | One to several sessions by target | A series, one to a few weeks apart |
| Usual recovery | Redness and mild swelling for hours to days | Redness; pinpoint crusts on treated spots | Mild redness for hours |
| At IN Eternity Clinic | Not offered | Offered | Offered |
| Concern | What is usually driving it | Kind of laser that targets it | What IN Eternity Clinic uses |
|---|---|---|---|
| Persistent redness or rosacea | Widened small vessels, inflammation, triggers | Vascular lasers (yellow, pulsed dye, KTP) or 675 nm | 少女光 675 nm laser, rosacea treatment, barrier care |
| Fine visible vessels | Dilated capillaries | Vascular lasers | Assessed individually; see facial thread veins |
| Red acne marks (PIE) | Small vessels left after inflammation | Vascular lasers or 675 nm; time | Red and dark acne marks |
| Brown acne marks (PIH) | Excess melanin after inflammation | Pico or toning, gently | Pico or laser toning with sun protection |
| Sun spots and freckles | Melanin in the upper skin | Pico laser | Pico laser |
| Melasma | Pigment cells kept active by sun, hormones and dermal signals, including vessels | Gentle pigment lasers within a medical plan | Melasma treatment |
| Dull skin, wanting “glow” | Texture, dehydration, uneven tone or redness | Depends on which of these dominates | R2 Glow, LDM facial |
“Glow” is the hardest of these to define. A face can look dull because of redness, uneven pigment, rough texture or dehydration, and each answers to something different. Choosing a laser for glow before deciding which of these is the problem is how people end up with a course that changes little.
“Glow is not a wavelength. Work out whether the problem is redness, pigment or texture, and the right laser is usually obvious.”
Melasma is now understood as more than excess pigment. Studies of melasma skin show more and larger small blood vessels than in nearby normal skin, and vascular signals appear to keep pigment cells active. That is the rationale for using a vascular laser in melasma. In one study of Asian patients with melasma, a copper bromide yellow laser (578 nm with 511 nm) improved pigment scores, and skin samples showed fewer vessels after treatment. It was a small study without a comparison group, and melasma tends to return after any procedure.
For rosacea, systematic reviews support vascular lasers and light for persistent redness and visible vessels, with most of the evidence for pulsed dye and KTP lasers and intense pulsed light. Yellow lasers work on the same target and are used for the same purpose, but they have fewer controlled trials. None of these lasers cures rosacea or stops flushing triggers; they reduce the vascular part of the problem.
Pico laser and laser toning have the stronger evidence for pigment, and the clearer warnings: low-fluence toning repeated too often can leave pale, mottled spots, which is why settings and intervals are kept conservative in Asian skin.
IN Eternity Clinic does not offer yellow laser. For the concerns yellow laser is used for, the clinic’s options are these:
The choice follows what the skin shows. Many plans combine a redness treatment and a pigment treatment in sequence, because red and brown marks often sit side by side after acne. How pico, Q-switched and toning differ from each other is covered in pico vs Q-switched vs laser toning.
General clinical observations used at consultation; they describe what is checked, not any individual result.
Yellow laser usually leaves redness and mild swelling for hours to a few days; small crusts can form over treated vessels. Because melanin also absorbs yellow light, a tan or darker skin raises the risk of blistering or post-inflammatory darkening.
Pico laser causes redness and, on treated spots, pinpoint darkening or fine crusts that lift within about a week. Post-inflammatory darkening is the main risk in Asian skin and is reduced by strict sun protection.
Laser toning leaves mild redness for hours. The specific risk is over-treatment: too many sessions too close together, or energy pushed too high, can leave pale, mottled spots that are slow to recover.
With all three, Singapore’s sun and heat matter. Daily broad-spectrum sunscreen, avoiding heat exposure for a few days after treatment and pausing irritating skincare reduce the risk of rebound pigment.
Most facial redness and pigment is benign. A few patterns need a diagnosis before any laser.
Where any of these apply, the first step is a diagnosis. A cosmetic plan can follow once that is settled.
Cost depends on the concern and the plan rather than the name of the laser: how many sessions are needed, whether redness and pigment are both treated, the area covered, and the skincare and sun protection that support the result. A single-target plan such as a few sun spots differs from a course for melasma with a redness component. At IN Eternity Clinic, Dr Sin Yong explains the plan and gives a written quote after assessment. The consultation fee is S$120, waived with any medical treatment.
No. Yellow laser is described on this page for comparison. For redness the clinic uses the 675 nm 少女光 laser, the Triple Hydrating LDM facial and medical rosacea care; for pigment it uses pico laser and laser toning.
Neither is better in general; they target different things. Yellow laser is absorbed mainly by blood vessels and is used for redness. Pico laser breaks up pigment and is used for brown spots. The concern decides which kind of laser fits.
Small studies in Asian patients report improvement in melasma with copper bromide yellow laser, on the rationale that melasma skin has more small vessels. Melasma still needs sun protection and medical skincare, and it tends to return after any procedure.
Vascular lasers such as yellow, pulsed dye and KTP lasers, and the 675 nm laser, act on the vascular part of redness. The cause matters first: rosacea, a damaged barrier, red acne marks and visible vessels each need a different plan.
No. Laser toning passes a low-energy Q-switched 1064 nm laser over the whole face many times across a course. Pico laser uses picosecond pulses, often aimed at specific spots. Both target pigment; toning is gentler per session.
It depends on why the skin looks dull. Redness, uneven pigment, rough texture and dehydration each answer to a different treatment. Working out which one dominates comes before choosing a laser.
Often, yes, because red and brown marks commonly sit side by side after acne. They are usually sequenced rather than done at full strength on the same day, and the order is set at assessment.
Usually redness and mild swelling for hours to a few days, sometimes small crusts over treated vessels. A tan or darker skin raises the risk of darkening, so sun protection in the weeks around treatment matters.
IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, Singapore 228210. By appointment with Medical Director Dr Sin Yong. Monday to Saturday, 11am to 8pm. WhatsApp or call +65 8815 3008. The consultation fee is waived with any medical treatment.
These sources describe mechanisms and general evidence. They are not a promise of any individual result; suitability is decided at an in-person assessment.