TCA CROSS — Chemical Reconstruction Of Skin Scars — treats the scar type everything else struggles with: the narrow, deep ice pick scar. A physician places a microdroplet of high-strength trichloroacetic acid into each scar's floor, deliberately injuring the tract so it rebuilds shallower. It is precise, decades-studied, operator-dependent — and one of the few treatments that reaches where no resurfacing laser can.
WhatsApp Dr Sin Yong →An ice pick scar is a deep epithelial tract — a well, not a dip. Fractional resurfacing polishes the surrounding plain but barely changes the well's depth, which is why patients finish laser courses with better skin and the same pinpoint holes. CROSS inverts the geometry: instead of treating the surface around the scar, it delivers a focal chemical injury into the scar floor itself, triggering collagen that fills and lifts the tract from below [1]. The original assessments of the technique and its later refinements report meaningful graded improvement across a course of sessions [1,2] — slow, cumulative, and unmatched for this scar shape.
This is the question that matters in Singapore, and the literature answers it directly: studies of CROSS in darker skin types report both efficacy and the central caution — transient post-inflammatory hyperpigmentation around treated scars is common and typically resolves, but technique discipline (droplet confined to the scar, no spillover) and strict photoprotection determine how clean the course runs [2,3]. The case literature also records the other edge of the blade: incorrectly delivered TCA can widen or worsen scars [3]. This is a physician's technique with a physician's learning curve — the entire reason it is performed, not sold, here.
Almost no scarred face carries only ice picks — the scar-type guide explains the usual mixture. In Dr Sin Yong's sequencing, CROSS handles the ice pick census while fractional platforms — the Tetra Pro SCAR3 programme — treat boxcars and the field, subcision releases rolling scars, and polynucleotide support feeds the remodelling between energy sessions. Active acne is controlled first via the acne programme; leftover flat marks are triaged as PIH or PIE. CROSS is a chapter in that book, not the book.
DIY TCA kits bought online — high-strength acid freehand on your own face is how case reports get written. Expecting one session to close a well that took years to form — remodelling is cumulative by design. Judging results in the first fortnight — each treated scar crusts, heals and then remodels for weeks. And expecting erasure — deep tracts improve substantially across a course; 'gone without trace' is not the honest endpoint for any scar treatment, this one included.
“You cannot resurface your way out of a well — CROSS works because it is the one technique that climbs down into the scar instead of polishing the ground around it.”
— Dr Sin Yong
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Each application stings sharply for seconds — most patients tolerate a full session without anaesthesia, and the treated-scar count per session is planned at assessment.
Each treated scar frosts white, then forms a small crust that sheds within about a week. The remodelling that lifts the scar floor continues for weeks after each session.
Courses of several sessions spaced weeks apart are standard in the study literature — depth and count of your ice picks set the number, mapped before starting.
Temporary darkening around treated scars is common in our skin types and typically fades with photoprotection. Confining acid to the scar floor — technique — is the main protection.
Only the ice pick component. Boxcar, rolling and raised scars each need their own tool — which is why scar-type mapping precedes every plan here.
Lasers remodel the surface plain; an ice pick's depth is largely below their reach. The two are teammates in a sequence, not competitors for the same scar.