Pico laser with CO2 (S3 Resurfacing Lift):
sequencing pigment and texture

Why would pico laser and CO2 be combined at all?

Pico laser and fractional CO2 are combined because pigment and texture are different problems in different layers, and many faces in Singapore carry both. A picosecond pulse lasts around a trillionth of a second, so a pigment particle is fragmented mainly by a pressure effect before much heat spreads; the body then clears the fragments. It acts on pigment already present, sun spots, freckles and some post-inflammatory marks, and in fractional mode it prompts remodelling around texture, but it does not rebuild the wall of a boxcar scar.

Fractional CO2 works the other way round. The DEKA SmartXide Tetra Pro vaporises microscopic columns of skin at 10,600 nm and leaves intact skin between them, so the dermis remodels collagen while the surface heals from the untreated islands. In the S3 Resurfacing Lift, point shots go into individual scar pits first and fractional passes follow. It changes texture and scar architecture, and it is a poor and risky way to remove a discrete sun spot, because the ablative wound is itself a trigger for post-inflammatory hyperpigmentation in Fitzpatrick III to V skin.

A face with boxcar scars across the cheeks and sun spots over the cheekbones therefore has two questions, and each laser answers one of them. Whether both are needed is decided at assessment, where Dr Sin Yong maps scar types with the skin stretched under directed light and examines the pigment with a dermatoscope where needed.

Which goes first, and why?

Which laser goes first is decided by which problem dominates and by pigment risk. Where scarring is the main complaint, fractional CO2 in the S3 sequence usually goes first, after any subcision or TCA CROSS the scar map calls for, and the pico laser follows once the resurfaced skin has healed and any post-inflammatory darkening has declared itself. Resurfacing changes the pigment picture, clearing some superficial marks and creating others, so pigment work done beforehand on skin about to be resurfaced is partly wasted and adds inflammation to a surface about to be wounded.

Where discrete pigment is the main complaint and texture is a minor, later question, the pico laser may go first, in spot mode or low-energy toning, and the resurfacing is timed to skin that has settled completely. The principle is the same in both directions: treat the problem that explains most of what you see, let the skin heal and show its pigment response, then decide whether the second laser is still indicated.

One rule does not change with the order. In Fitzpatrick III to V skin the two lasers are not stacked over the same area in one visit, because each is an inflammatory insult and inflammation is what drives melanocytes to make pigment. Treating a different zone on the same day is a separate question, decided by how much total inflammation the skin is being asked to carry.

“The method is matched to the scar, not the scar to the method.”

Dr Sin YongOn acne scar morphology

How is the spacing between the two decided?

Spacing is set at review, and the review is timed to healed skin rather than to a calendar. After fractional CO2 the surface must have closed, peeling finished and pinkness be settling before the pico laser is considered, because post-inflammatory hyperpigmentation often appears weeks after treatment, when skin that looked clean begins to darken. Treating that darkening early with a second laser treats inflammation with more inflammation.

After a pico treatment the logic is the same in reverse: treated spots crust and shed, and the skin beneath looks pink before it blends in. Resurfacing is planned only once that pink has gone and no late darkening has appeared. Sun exposure between the two matters as much as the interval, and a recent tan defers either laser.

At review Dr Sin Yong examines the skin in good light, compares it with the photographs in your medical record, and decides whether the second laser is still indicated, over which zones, in which mode and at what settings. In melanin-rich skin the conservative choice is often to stage further than seems necessary, and a plan can end with the decision that the second laser is not needed. The page on post-inflammatory hyperpigmentation explains why patience is part of the treatment.

Who should not combine pico laser with CO2?

Active melasma over the field to be resurfaced is the clearest reason not to combine. Melasma is chronic, driven by hormonal, vascular and ultraviolet factors, and it is provoked by heat; fractional CO2 is an ablative heat injury, and adding a second laser over the same area compounds the risk of rebound. Melasma is managed conservatively as a longer plan built on photoprotection and topical therapy, and texture work on a melasma-prone face is planned around it rather than through it.

Both lasers are deferred with a recent tan, active acne, infection or a cold sore in the area, photosensitising medicines, recent isotretinoin until the interval has been discussed, a tendency to keloid or hypertrophic scarring, and in pregnancy. Conditions that slow healing weigh against adding a second inflammatory treatment. A history of marked darkening after an earlier laser does not rule treatment out, but it changes the settings, widens the spacing and may call for a test spot.

Any pigmented mark that is changing in size, shape or colour, bleeding or unlike the others is examined first and may be referred for dermatological assessment before any laser is considered.

What are the risks of stacking two lasers?

The risks of stacking are additive inflammation and a surface asked to heal twice. Each laser has expected effects: redness, warmth and crusting over treated spots after pico; redness, swelling, oozing, crusting and peeling after fractional CO2. The risks that matter are post-inflammatory hyperpigmentation, which can take months to fade; prolonged redness; pale or mottled spots after frequent repeated toning; infection, acne-like eruptions or a cold sore flare while the resurfaced surface is open; and, with either laser used too aggressively, blistering or new scarring.

A retrospective study of 490 deep fractional CO2 treatments recorded adverse events after 13.6% of treatments, most often acne-like eruptions, cold sore outbreaks and bacterial or yeast infections. Adding a second laser to skin that is still healing raises the chance of each of these and makes any problem harder to attribute. These risks are reduced, not removed, by mapping scar and pigment separately, choosing wavelength, energy, density and pulse shape for Fitzpatrick III to V skin, treating one problem at a time, spacing at review, and strict sun protection throughout. The complication care page sets out which signs after laser need prompt attention.

Combination is not a promise about outcome. A pico laser fragments pigment that is present but does not stop new pigment forming, and fractional CO2 improves scar architecture without returning skin to an unmarked state.

What determines the fee for a combined plan?

The fee depends on the area and number of zones, what the assessment finds the pigment and scars to be, which pico wavelengths and modes are used, the depth and density of the CO2 settings, whether subcision or TCA CROSS are part of the S3 sequence, and how the plan is staged. Singapore's rules prevent prices from being advertised, so no figure is given here.

A written, itemised quote is given after the consultation, naming each laser, the zones and the review that follows, with the second laser quoted as a decision to be confirmed at review rather than as a package. The how we quote page explains what the quote contains, and the consultation process page sets out the steps from enquiry to follow-up.