Dr Sin Yong · MBBS (NUS) · MRCS (Edin) · MSc Aesthetic Medicine (London) · MSc Practical Dermatology (Cardiff) · International KOL
Most disappointing scar treatments share one mistake: they treat the surface of a scar that is anchored underneath. A rolling acne scar is a normal-looking skin surface tethered down by fibrous bands. A boxcar scar is a punched-out defect with sharp walls. An icepick scar is a deep, narrow tract. A keloid is the opposite problem entirely — scar tissue that has overgrown its boundary. Each of these is a different structure, and each responds to a different tool. Reconstruction begins by naming the structure.
“You can resurface a tethered scar indefinitely. The tether keeps pulling it down.”
— Dr Sin Yong
Fractional lasers rebuild surface texture superbly — but a laser cannot cut a fibrous band. If a scar is tethered, the band re-anchors the surface after every resurfacing pass. That is why tethered rolling scars are released first by subcision, a needle-based technique described in the dermatologic literature since the 1990s, which frees the scar floor so it can rise. Only then does resurfacing have something worth polishing.
Subcision releases tethered and rolling scars from below. TCA CROSS places high-strength trichloroacetic acid precisely into icepick tracts to collapse and rebuild them. Fractional CO2 laser rebuilds walls and surface texture on boxcar scarring. Injectables and biostimulators support atrophic floors. Intralesional therapy flattens keloids and hypertrophic scars — a different pathway for a different disease. Most reconstructed scars need a planned sequence of several of these, in the right order, spaced for healing.
This structural approach is covered in depth on the 4D Scar Reconstruction page, with acne-specific planning under acne scar treatment and scar-type identification in the acne scar types guide.
Every scar consultation here starts by mapping each scar's type under directed lighting and stretch testing — because a single cheek commonly carries rolling, boxcar and icepick scarring together, and a plan that treats them identically wastes both sessions and skin. The sequence, the tools and the realistic scope of improvement are explained before anything is booked. Scars are reduced and remodelled; medicine does not erase them, and you deserve that honesty at the start.
Scar reconstruction in Singapore at Dr Sin Yong's practice is planned by scar structure: tethered and rolling scars are released by subcision before resurfacing, icepick tracts are treated with TCA CROSS, boxcar scarring is rebuilt with fractional CO2 laser, and keloids follow their own intralesional pathway. This information is educational and is not a substitute for a medical consultation.
Every scar is mapped by structure before any treatment is proposed — rolling, boxcar, icepick, tethered or keloid.
WhatsApp Dr Sin YongThe full structural protocol — subcision, TCA CROSS, fractional laser and injectables in sequence.
Acne-specific scar planning with the Tetra Pro CO2 platform.
When scar tissue overgrows — a different disease with different treatment.
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