Acne scar laser treatment in Singapore:
which laser, for which scar

Acne scar laser treatment Singapore: three kinds of laser, three jobs

A laser treats tissue by being absorbed by something in it. For acne scars the useful target is water in the dermis, and the three laser families differ in how much of that tissue they remove and how deep they reach (Alexiades-Armenakas 2008). Ablative lasers vaporise tissue; fractional ablative lasers vaporise it in microscopic columns and leave intact skin between them, so the surface heals from the bridges. Non-ablative fractional lasers heat columns of dermis without removing the surface. Picosecond lasers are different again: their very short pulses act mainly on pigment by a pressure effect, and in fractional mode they prompt fine remodelling near the surface. In Dr Sin Yong’s practice those three families map onto the S3 Resurfacing Lift, FSX Laser and the picosecond protocols used for post-acne marks. The acne scar treatment Singapore guide sets out where each sits in the full sequence; this page is about the lasers alone.

Which laser is used for acne scars?

Acne scar laser treatment usually means fractional resurfacing: ablative fractional CO₂, such as the DEKA platform behind the S3 Resurfacing Lift, vaporises fine columns and remodels the dermis; non-ablative lasers heat without removing the surface; fractional pico suits shallow texture in pigment-prone skin. No laser releases a tether or reaches an ice-pick floor. Compare them on subcision vs laser, Fraxel vs CO2 vs Tetra, pico laser for acne scars and RF microneedling for acne scars.

FSX Laser: the surface-directed option

FSX Laser is Dr Sin Yong’s combination laser protocol using 1540 nm erbium glass and 1927 nm thulium wavelengths. The 1540 nm wavelength reaches the dermis for collagen work; 1927 nm is absorbed more superficially, where pigment and surface texture sit. Neither removes the skin surface. For acne scars it is directed at superficial scars: shallow boxcar scars, fine textural scarring and the post-acne marks that often sit between scars. Its place in the plan comes from recovery: redness that settles, occasionally fine scabbing in treated zones that is left to shed, rather than the open healing phase that follows fractional CO₂. Settings are adjusted for darker skin types, including Fitzpatrick V and VI, after assessment. What it cannot do is reach a deep scar floor or release a tether, so a deep boxcar or an ice-pick pit is assigned elsewhere.

S3 Resurfacing Lift: fractional CO₂ at several depths

The S3 Resurfacing Lift runs on the DEKA Tetra Pro, a fractional CO₂ laser at 10,600 nm, and is the protocol Dr Sin Yong uses most for acne scars. Rather than a uniform pass across the cheek, he places precision point-shot ablations into individual scar pits first, then applies fractional passes across the surrounding skin, so pits are treated at depth before the skin around them is resurfaced. Fractional delivery lets density and depth be set separately: dense, deep columns where scars sit, lighter passes between them. It is the choice for deep ice-pick and boxcar scars and for scars that plateaued after earlier CO₂ or RF microneedling. The cost of that reach is recovery: redness, swelling and fine crusting while the channels close, with strict sun protection afterwards. Local anaesthetic is applied beforehand. Depth decides between the two lasers: FSX Laser for superficial scars, with a shorter recovery than S3, and the S3 Resurfacing Lift for deep ice-pick and boxcar scars.

Picosecond and other non-ablative lasers: marks, not depth

Many people searching for acne scar laser treatment are really looking at flat brown or red marks, which are pigment and vessel problems rather than scars. Resurfacing them can deepen pigment. Dr Sin Yong treats post-inflammatory pigment with picosecond work at 785 nm, part of his R2T2 protocol on the DEKA TORO, and post-inflammatory redness within the FSX protocol or with vascular settings. Fractional picosecond also suits shallow texture in pigment-prone skin, because it leaves the surface intact. What none of these does is change the depth of a pit or lift a tethered valley; a face with both marks and depressions has colour and contour planned separately, as the post-inflammatory hyperpigmentation page explains.

Laser treatment for acne scars: which scar suits which laser

The classification most clinicians use divides depressed acne scars into ice-pick, boxcar and rolling types (Jacob 2001), and most faces carry more than one. The table is the reading aid Dr Sin Yong uses when a patient asks which laser; the answer is usually that the lasers are assigned scar by scar, not face by face.

The PIH question in Fitzpatrick III to V skin

Most skin treated in Singapore is Fitzpatrick III to V, and in that skin inflammation reliably leaves pigment behind. Fractional CO₂ produces more textural change per session than non-ablative fractional laser, at the price of longer recovery and a higher pigment risk in darker phototypes (Alexiades-Armenakas 2008). That trade is why the S3 protocol is calibrated to limit thermal spread, why point shots are kept to the pits and fractional passes set less densely, and why the interval between stages is set by healing rather than by a calendar. It is also why FSX Laser, with its intact surface, is the first choice where the scars are shallow enough for it, and why a fresh tan, recent isotretinoin or a history of marks darkening after inflammation changes the plan. Sun protection after any of these lasers is part of the treatment rather than an extra. Risks are set out plainly at consultation: prolonged redness, pigment change, infection, a cold sore flare and, rarely, a new scar. Responses vary between individuals and no outcome is promised.

Acne scars on Fitzpatrick III–V skin

Most faces treated on Orchard Road are Fitzpatrick III to V, and that changes the plan more than any device choice. Ablative energy on darker skin carries a higher risk of post-inflammatory hyperpigmentation, so settings are lowered, passes are staged, and the skin is prepared and protected before and after. It is also why superficial scars are given the FSX Laser, which has a shorter recovery than S3, and why Secret DUO, which spares the surface, is favoured for texture. Deep ice-pick and boxcar scars still need the S3 Resurfacing Lift; the difference on darker skin is the density of the passes and the spacing between sessions, not whether the laser is used.

What no laser can do

A laser works from the surface down. A rolling scar is held down by a fibrous band in the subcutaneous plane, below the depth at which resurfacing energy acts, so lasering it polishes a dimple that is still being pulled down; release by subcision comes first (Orentreich 1995). An ice-pick scar is a well deeper than it is wide, and no column from above reaches its floor the way TCA CROSS placed into the pit does. A scar sitting over lost volume stays shadowed until the deficit is supported. Raised scars should not be resurfaced at all. This is the logic behind 4D Scar Reconstruction: release, support, then resurface. Where the plan calls for RF microneedling instead of or alongside laser, the Secret DUO delivers bipolar radiofrequency through insulated microneedles with the surface spared, which is why it is often preferred in Fitzpatrick IV to VI skin (Syder 2023). Who decides all this, and what to check about them, is on the who treats acne scars in Singapore page; the full map of every acne and scar guide on this site is one click away.

“No laser cuts a tether and no laser climbs down an ice-pick well. Ask which scar the laser is for before you ask which laser.”

Dr Sin YongOn acne scar lasers

Dr Sin Yong explains