TCA CROSS for Acne Scars

Posted on [post_date] [post_comments] [post_edit]

TCA CROSS — "Chemical Reconstruction of Skin Scars" — is a precise application of high-concentration trichloroacetic OnabotulinumtoxinAAbobotulinumtoxinAIncobotulinumtoxinAPrabotulinumtoxinALetibotulinumtoxinARimabotulinumtoxinBHyaluronic Acid FillersCalcium Hydroxylapatite FillersPoly-L-lactic Acid FillersPolymethylmethacrylate FillersAutologous Fat GraftingForehead Lines TreatmentGlabellar Frown Lines TreatmentCrow's Feet TreatmentBunny Lines TreatmentChemical Brow LiftLip FlipGummy Smile CorrectionMasseter ReductionJaw SlimmingDimpled Chin SmoothingCobblestone Chin SmoothingNefertiti Neck LiftMicro-BotoxMesotoxHyperhidrosis TreatmentChronic Migraine ReliefBruxism TreatmentTMJ TreatmentCervical Dystonia TreatmentNeck Spasm TreatmentBlepharospasm TreatmentLip AugmentationLip ContouringCheekbone EnhancementTear Trough FillersNasolabial Fold SofteningMarionette Line FillersLiquid RhinoplastyNon-Surgical Nose JobJawline ContouringJawline DefinitionChin AugmentationTemple VolumisingHand RejuvenationAcne Scar Subcision Filling (TCA) directly into individual acne scars, particularly the deep narrow type known as "ice pick" scars. The treatment works fundamentally differently from a standard TCA peel: instead of applying mild-to-moderate TCA across the entire face for general skin refreshment, CROSS delivers a small drop of high-concentration TCA (typically %) precisely into each individual scar, triggering controlled wound healing that fills the scar from within.

This guide covers what TCA CROSS actually does, which scars respond well, who suits the treatment, what to expect from the procedure and recovery, and how it compares with other acne scar treatments. For a comprehensive treatment guide to acne scarring more broadly, see our .

What TCA CROSS actually does

The CROSS technique was developed in Korea in the early 2000s as a way to address ice pick acne scars — the narrow, deep, vertical scars that other treatments struggle to reach. Standard treatments like laser resurfacing and microneedling work well on broader, shallower scars but produce limited results on ice pick scars because they don’t penetrate deeply enough to reach the base of the scar.

The CROSS technique solves this by applying TCA directly into the scar, where it:

Importantly, the surrounding healthy skin is largely unaffected — the high-concentration TCA stays within the scar pit due to its small surface area and the careful application technique.

Which scars respond well to TCA CROSS

The technique works best on specific scar types:

Ice pick scars (the primary indication). Narrow, deep, V-shaped scars that look like the skin has been punctured with an ice pick. Typically 2mm or smaller in diameter at the surface. These are the scars TCA CROSS was designed for and produces the best results.

Narrow boxcar scars. Small, U-shaped depressions with relatively sharp edges. CROSS can help these though combined treatment with other modalities is often needed.

Rolling scars (limited benefit). Broader, scars with sloping edges. CROSS is less effective here — these respond better to subcision, fillers, or energy-based treatments.

Hypertrophic or keloid scars (not appropriate). Raised scar tissue. TCA CROSS isn’t the right treatment — these need different approaches.

A consultation establishes which scar types you have and whether CROSS is for your specific case. Most patients with acne scarring have a mix of scar types and benefit from combined treatment using multiple techniques.

What to expect from the procedure

Pre-treatment. Photographic documentation of your scars. Skin assessment for treatment suitability. Test patch may be performed initially for patients with darker skin tones or sensitive skin.

The treatment session.

Immediately afterwards. White frosting at each treated scar, fading to redness over a few hours. The treated points form small scabs over the days.

The next 7-10 days.

Aftercare:

Timeline of results

TCA CROSS gradual that develops over weeks to months:

Weeks 2-4: initial scab healing complete. The scar may look similar to before treatment at this point.

Weeks 4-8: initial improvement in scar depth begins to be visible as new collagen forms within the scar.

Months 2-4: meaningful improvement in scar appearance. The scar is shallower, narrower, and less visible.

Months 4-6: continued improvement as collagen remodelling matures. Many patients see optimal results around this timeframe.

Repeat treatments: typically 2-6 sessions spaced 4-6 weeks apart, depending on scar severity. Some scars need a single treatment; others need multiple sessions.

Final result: ice pick scars treated with appropriate CROSS protocol typically improve by 50-80% in depth and visibility, with some completely eliminated. Complete eradication of all scarring is uncommon — realistic expectations are improvement rather than complete clearance.

Combined treatment for acne scarring

Most patients with acne scarring benefit from multiple treatments because most patients have multiple scar types:

TCA CROSS for ice pick scars.

Subcision for rolling scars and tethered scars. The technique uses a fine needle to break up the fibrous bands tethering the scar to deeper tissue, allowing the scar to release and improve.

Microneedling or radiofrequency microneedling () for broader textural improvement and skin quality. Stimulates collagen across the broader scarred area.

Fractional laser resurfacing. Erbium or CO2 laser produces controlled thermal injury that triggers collagen remodelling across the treated area. Useful for boxcar scars and overall texture improvement.

Dermal filler for individual depressed scars that won’t respond to other treatments — can provide immediate improvement that lasts months while other treatments work over longer timeframes. See our .

Punch excision for individual deep ice pick scars that don’t respond to CROSS — surgical removal of the scar with closure.

A comprehensive treatment plan typically involves 2-4 different techniques sequenced over 6-12 months to address the full range of scar types present.

Risks and considerations

TCA CROSS has a generally good safety but isn’t risk-free:

Common (mild and expected):

Less common:

Rare:

Patients with darker skin tones (Fitzpatrick types IV-VI) require particular care — the risk of pigmentation changes is higher. Test and conservative initial treatment are appropriate. Many darker-skinned patients still benefit from CROSS; the protocol is just adjusted accordingly.

Who is suitable for TCA CROSS?

The ideal candidate has:

Less suitable:

Cost

TCA CROSS at Centre for Surgery is priced per session:

Treatments are typically spaced 4-6 weeks apart.

treatment plans (TCA CROSS + microneedling + subcision + dermal filler) cost £2,500-£5,000 for a comprehensive 6-12 month treatment course.

, including 0% APR, are available across all treatment plans.

How TCA CROSS differs from standard TCA peels

A common point of confusion: TCA CROSS uses high-concentration TCA (70-100%) applied to individual scars only. Standard TCA peels use lower concentration (15-35%) applied across the entire treatment area.

Standard TCA peels address broader skin concerns — surface texture, pigmentation, fine lines, sun damage. They produce general skin refreshment but don’t reach deeply enough to address ice pick scars specifically.

TCA CROSS individual deep scars without affecting surrounding skin substantially. It’s a focused, targeted treatment for a specific problem.

The two treatments can be combined — TCA CROSS for individual scars, with periodic standard TCA peels for overall skin quality. They’re complementary rather than alternatives for patients with acne scarring plus general skin concerns.

Combining with active acne treatment

For patients with both active acne and scarring, the typical sequence is:

Stage 1: control active acne first. Treating scars while acne continues active produces new scars even as old ones improve. Patients are typically asked to achieve at least 3-6 months of acne control before scar treatment begins.

Stage 2: assess the scar pattern. Once acne is controlled, the underlying scar pattern becomes clear. A treatment plan addresses the specific scar types present.

Stage 3: begin scar treatment course. Typically a combination of techniques sequenced over 6-12 months.

Stage 4: maintenance. Continued active skincare, sun protection, and any additional treatment sessions as needed.

The whole process can take 1-2 years for substantial scarring. Setting realistic expectations about timeline is essential.

Common questions

Brief stinging sensation at each application point — uncomfortable but tolerable. The total treatment is quick (15-30 minutes), so the discomfort is brief. Topical anaesthetic isn’t typically needed.

Complete elimination is uncommon. Realistic expectations: 50-80% improvement in treated scars, with substantial reduction in . Some patients see better results; others less.

Initial healing takes 1-2 weeks. Meaningful improvement begins at 4-8 weeks. Maximum effect at 4-6 months after each treatment.

2-6 sessions depending on scar severity and patient response. Some scars improve substantially after a single session; others need multiple treatments.

Yes, with appropriate care. The protocol is to reduce post-inflammatory pigmentation risk. Test patches may be performed initially. Many darker-skinned patients benefit substantially from CROSS — the technique just requires more careful technique and aftercare.

Yes — small dark scabs at each treated point are visible for 7-10 days. Most patients plan around social events for this reason. Makeup can cover scabs partially but may interfere with healing.

Light exercise after 24 hours. Avoid heavy sweating or activities that might disturb the scabs for the first week.

The improved scars don’t typically worsen — the collagen them is stable tissue. However, new acne breakouts can produce new scars, which is why ongoing acne control is important.

Yes — TCA CROSS is often combined with microneedling, subcision, laser resurfacing, and dermal filler for comprehensive scar treatment. Most patients benefit from combined approaches.

They address different scar types. CROSS works on deep narrow scars (ice pick). Laser works on broader, shallower scars. Most patients with acne scarring have both types and benefit from combined treatment.

Centre for Surgery · CQC-regulated · GMC specialist-registered surgeons · · · ·

Filed Under:

Share this post

Primary Sidebar

I agree to receive marketing communications ()

I agree to receive marketing communications ()

Centre for Surgery is a private hospital on London’s Baker Street, plastic and cosmetic surgery through GMC-registered specialist surgeons. Our expertise spans facial procedures including and , , for men, and body contouring procedures such as and . Patient safety, surgical excellence and natural-looking results sit at the heart of everything we do.

Centre for Surgery is a CQC-regulated private on London’s iconic , offering plastic and cosmetic surgery led by GMC-registered consultant surgeons.

Marylebone

London

W1U 6RN

Mon – Sat, 9am – 6pm

Saturday consultations available