What 4D Scar Reconstruction is, and the four dimensions of a scar
A depressed acne scar is a change in the structure of the skin, not a mark on its surface, and most established scars have more than one part. 4D Scar Reconstruction names four of those parts and aims a separate step at each, in a fixed order, because the step that suits one part does nothing for another.
| Dimension | What it is in the scar | The step aimed at it |
|---|---|---|
| Tethering | Fibrous bands beneath the scar pull its base down, as in rolling and tethered scars | Wide-zone subcision, releasing the bands across an area rather than scar by scar |
| Volume | Tissue lost beneath a scar, which shows once the scar has been released | Calcium hydroxylapatite (CaHA), a collagen-stimulating filler, placed into the released space where a deficit exists |
| Depth | Narrow tracts and pits whose floor sits deep in the dermis | TCA CROSS placed into ice-pick tracts, and point-shot CO2 ablations into individual pits |
| Surface texture | The uneven surface around and between the scars | Fractional CO2 passes across the zone, as part of the S3 Resurfacing Lift |
Pigment is a separate problem. Brown marks left by acne are colour, not contour, so they are treated with a picosecond laser at 785 nm rather than with more resurfacing, which can darken them. Red marks that blanch under pressure are not scars at all.
Why the order matters
The steps run in one order: release, support, then resurfacing. A laser remodels skin in whatever position it finds it, so a scar still pinned down by a band stays pinned after resurfacing. Subcision comes first, and the small bleed it leaves in the released space acts as a natural spacer while it organises. Filler support and TCA CROSS follow, and the S3 Resurfacing Lift places point shots into pits before fractional passes cross the skin around them.
Some steps can share a visit, such as subcision with filler support. Resurfacing usually follows once the released skin has healed, and each stage is reviewed against standardised photographs before the next is timed.
“You can resurface a tethered scar indefinitely. The tether keeps pulling it down. Release comes first.”
Dr Sin Yong
Scar treatment in Singapore: which scars 4D Scar Reconstruction suits
4D Scar Reconstruction is built for established depressed scars with more than one component: above all acne scars that mix rolling, tethered, boxcar and ice-pick types, and scars that plateaued after a single treatment. Other scars are routed to the method their structure needs, which is where any scar removal plan in Singapore should start.
| Scar | What usually needs doing | Where it is covered |
|---|---|---|
| Acne scars: rolling, tethered or mixed | The main indication: release, filler support, then the S3 Resurfacing Lift | This page, and the acne scar treatment guide |
| Acne scars: mostly ice-pick | TCA CROSS into the pits, within the same programme | TCA CROSS |
| Chickenpox and other depressed pits | The same logic as acne scars when the base is tethered | This page |
| Surgical scars | Timing decides the method; revision surgery is referred | Surgical scar timing |
| Keloid and hypertrophic scars | Injection-based treatment with silicone, pressure and laser for redness; no ablative resurfacing | Keloid treatment |
| Stretch marks | Red marks and white marks are approached differently | Stretch mark treatment |
Who it suits, who should wait, who is referred on
| Group | What it looks like | What usually happens |
|---|---|---|
| Tends to suit | Depressed acne scars of more than one type; depressed surgical or injury scars | Each scar is graded, and a written plan names the step for each |
| Better to wait | Active acne; a recent course of oral acne medication; infection or a cold sore in the area; a fresh tan; pregnancy or breastfeeding | Acne is controlled first, and timing is agreed at consultation |
| Weighed first | A keloid tendency; blood thinners or a bleeding tendency; allergy to a product to be used | Some steps are adjusted or left out |
| Starts elsewhere | Flat red or brown marks only; a raised, itchy or growing scar | Redness or pigment care; raised scars follow keloid treatment |
| Referred on | Isolated scars too deep or wide for TCA CROSS or resurfacing; width or position as the problem; an uncertain diagnosis | A plastic surgery or dermatology specialist |
Anyone wanting a fixed, exact result is poorly served, because response depends on scar type, depth and tethering. Unsure of your scar type? Try the four-question acne scar type checker, or read acne scar types explained.
Surgical scars: why timing matters
A surgical scar keeps changing long after the operation, so when it is seen matters as much as which method is chosen. Repair runs through inflammation, proliferation and remodelling, when early type III collagen is replaced by stronger type I, and a scar responds to non-surgical work more readily while it is still remodelling. A freshly closed scar gets silicone-based care and sun protection, not ablative resurfacing. A scar that is still red gets laser for redness, and early assessment if it is raised. A mature, pale scar is still treatable in the 4D sequence, but each step has to restart remodelling deliberately.
A raised scar that stays inside the wound edge is hypertrophic and is assessed early. One that grows beyond the edge is a keloid, managed under keloids and hypertrophic scars and never simply cut out. Early is better and late is workable; the detail is in the surgical scar timing guide.
“If you have a scar from surgery, when you treat it matters as much as how.”
Dr Sin YongOn timing scar treatment · from his Instagram explainer series
Surgical Scars Have a Treatment Window. Are You In It?
Watch on YouTube: Scar Removal Singapore: Why Timing Matters for Surgical Scars
Read the transcript
Surgical scars have a window. If you've got a scar from surgery, when you treat it matters as much as how. Scar tissue behaves very differently in the months after surgery than it does years later. There's a period when it is still remodelling and far more responsive to intervention. Many people wait years and then wonder why progress has stalled. If you're inside that window, don't sit on it.
Transcript of Dr Sin Yong's video, lightly edited for reading.
4D Scar Reconstruction compared with single acne scar treatments
Each tool in the sequence also exists on its own, and for some faces one is enough. Laser resurfacing alone works on one dimension, surface texture: it does not release tethering or restore lost volume, which is the usual reason a course of laser plateaus. Depth decides between the two lasers: the FSX Laser for superficial scars, and the S3 Resurfacing Lift for deep ice-pick and boxcar scars.
| Option | What it does | What it cannot do | Tends to suit |
|---|---|---|---|
| 4D Scar Reconstruction | Release, support and resurfacing in sequence | Promise a set outcome | Mixed depressed scars, and scars that plateaued after one method |
| Subcision on its own | Releases the bands under rolling and tethered scars | Resurface the surface or soften scar edges | Tethered scars with a fairly even surface |
| TCA CROSS on its own | High-strength trichloroacetic acid placed into each narrow tract | Release tethering or treat a wider zone | Narrow, deep ice-pick scars |
| S3 Resurfacing Lift (fractional CO2, DEKA Tetra Pro) | Point shots into pits, then fractional passes around them | Release the bands beneath rolling scars, or replace lost volume | Deep boxcar and ice-pick scarring, and texture |
| FSX Laser | Finer surface refinement, with a shorter recovery than S3 | Reach deep scars or release tethering | Superficial scars, and texture left after the structural steps |
| RF microneedling | Radiofrequency heat delivered in the dermis through fine needles | Release tethering, or ablate scar edges as CO2 does | Shallow rolling scars and skin quality |
| Surgical revision, by referral | Punch excision, elevation, grafting or formal revision | Treat the surrounding texture; Dr Sin Yong does not perform it | Isolated scars too deep or wide for non-surgical methods |
CaHA gives support when it is placed and also acts as a biostimulator. Poly-L-lactic acid and hyaluronic acid work through different mechanisms, and which material, if any, suits a released scar is decided at assessment. Compare further: subcision vs laser, acne scar lasers and the DEKA Tetra Pro.
Your Scar Treatment Plateaued. Here's the Usual Reason.
Watch on YouTube: Subcision: Why Your Acne Scar Treatment Plateaued
Read the transcript
Why did your scar treatment stop working? Five sessions in and a plateau is not bad luck. It usually means one scar type is being ignored. Resurfacing works on the surface. If a scar is anchored to the tissue underneath, you can resurface it forever and the tether will keep pulling it down. It has to be released first. If nobody has told you which of your scars are tethered down, that's the question to ask next.
Transcript of Dr Sin Yong's video, lightly edited for reading.
What 4D Scar Reconstruction cannot do, and the alternatives
No method erases a scar. The realistic aim is a scar that is shallower and less noticeable under ordinary light, judged against standardised photographs at review. Acne scarring is graded on the Goodman and Baron scale, from grade 1 (flat marks) to grade 4 (severe), and the grade, scar type and degree of tethering set what is realistic. That is discussed at assessment, before anything is planned.
- Not a single laser: it sequences subcision, filler support, TCA CROSS, S3 resurfacing and a separate pigment pass.
- Not a burn or trauma scar programme: it is built for depressed acne scars, and surgical scars are assessed case by case.
- Not surgical revision: scars that need excision are referred to a plastic surgery or dermatology specialist.
- Not for raised scars: keloids and hypertrophic scars follow an injection-based plan without ablative resurfacing.
- Not for flat marks or active acne: marks need redness or pigment care, and breakouts are controlled first.
Scar removal surgery or non-surgical treatment?
Scar removal surgery means cutting a scar out and re-closing it, or re-orienting it. It suits a narrow group: scars stretched into a wide band, scars that pull across a joint or distort an eyelid or lip, and isolated pits too deep or wide for resurfacing. Width, shape and position are surgical problems; colour, height, depth and tethering usually are not. Dr Sin Yong does not perform this surgery: he refers, and plans non-surgical work around it, since a revised scar is a new scar that remodels in turn. See scar removal surgery vs non-surgical options and acne scar surgery in Singapore.
Risks and side effects of 4D Scar Reconstruction
Each layered method brings its own risks, explained at consultation. Expected effects are redness, swelling and pinpoint scabbing after resurfacing, bruising and tenderness where subcision was done, a small crust on each scar after TCA CROSS, and swelling or bruising at injection points.
Less often there can be prolonged redness, pigment change (more likely in darker skin and with sun exposure), infection, a cold sore flare, lumps from an injected product, or a scar that responds less than hoped. Settings calibrated for Fitzpatrick III to V skin, strict sun protection and not picking scabs reduce these risks but do not remove them.
- Pain that increases or does not settle
- Spreading redness, warmth or pus
- Blistering, a cold sore, or a wound that is slow to heal
- A firm lump, marked swelling, or skin that turns white or dusky after an injectable
What to expect: the acne scar assessment, treatment and aftercare
Before you book
- Declare all medicines, including oral acne medication and blood thinners.
- Mention pregnancy, breastfeeding, cold sores and any keloid history.
- Avoid sun and tanning, and pause retinoids and acids as advised.
- Bring photographs of the scars and records of surgery or earlier treatment.
No GP referral is needed to book an assessment at a private clinic.
The assessment
Dr Sin Yong examines every scar himself under angled light, stretching the skin to see which are tethered, and grades them by type and depth. Standardised photographs are taken for your medical record. You leave with a written plan naming which scar gets which step, in what order, the fee factors and the option of no treatment; see the acne scar assessment.
On the treatment days
The steps are done under local or topical anaesthetic. Subcision is usually felt as pressure and movement, resurfacing as heat, and TCA CROSS as a brief sting on each scar. The number and spacing of treatments are set individually and reviewed as the skin remodels. Where superficial scarring remains after the structural steps, the FSX Laser is considered at review.
Aftercare
| Stage | What is usually expected | What to do |
|---|---|---|
| Straight after | Redness, swelling and pinpoint oozing after resurfacing; bruising where subcision was done | Cleanse gently, and use only the products you were given |
| While it heals | Fine scabbing and peeling; bruises changing colour | Let scabs fall away; avoid heat, heavy exercise and pressing on released areas |
| As it settles | Pinkness that fades as the skin remodels | Plain cleanser and moisturiser; restart retinoids and acids only when the clinic advises |
| Throughout | Skin that is prone to pigment change | Shade, a hat and sunscreen once advised; attend review |
Recovery by method is on acne scar treatment downtime, and the resurfacing checklist on CO2 laser aftercare.
How Dr Sin Yong approaches scar removal in Singapore
Dr Sin Yong starts with the scars, not the device: he grades each one, decides which dimensions it carries, and only then chooses a step. Every consultation and every step, from subcision to the last laser pass, is performed by him at his clinic on Orchard Road, Singapore. His view is plain: release a tethered scar before resurfacing it, treat pigment separately, and refer a scar that needs surgery rather than lasering it again.
The resurfacing step is his S3 Resurfacing Lift on the DEKA SmartXide Tetra Pro, with settings calibrated for the Fitzpatrick III to V skin that predominates in Singapore. He is a Global Key Opinion Leader for DEKA and first author of a clinical paper on the S3 Resurfacing protocol, currently in preparation with DEKA's clinical research team; see DEKA Global Key Opinion Leader.
Aesthetic physician, dermatologist or plastic surgery specialist?
All three treat acne scars in Singapore, and the work overlaps. "Specialist" is a protected title for doctors on the Singapore Medical Council's Specialists Register, which includes dermatology and plastic surgery. Dr Sin Yong is an aesthetic physician, not a registered specialist. He holds an MSc in Aesthetic Medicine with Distinction (Queen Mary University of London) and an MSc in Practical Dermatology (Cardiff University). He refers punch techniques and formal revision to a plastic surgery specialist, and an uncertain diagnosis to a dermatology specialist. More on who treats acne scars in Singapore.
Questions to ask at any scar consultation
Ask which scar types the doctor sees, which method is matched to each and why, what each cannot do, how pigment risk is managed in your skin type, and when a scar would be referred for surgery. Check that the doctor who assesses you performs each step.