TCA Cross Scar Therapy
Target Deep Ice-Pick and Selected Boxcar Acne Scars
TCA CROSS is a targeted acne scar treatment used primarily for deep ice-pick scars and selected boxcar scars.
Unlike a conventional chemical peel, which is applied across a broader area of skin, TCA CROSS involves placing a small amount of high-concentration trichloroacetic acid directly into individual depressed scars.
The controlled chemical reaction stimulates a healing response within the scar, encouraging collagen remodelling and gradual improvement in scar depth and appearance.
Because it targets individual scars rather than resurfacing the entire face, TCA CROSS is particularly useful for deep, narrow scars that may respond less effectively to broader resurfacing treatments alone.
Learn more about acne scar treatment →
What is TCA CROSS?
TCA CROSS stands for Trichloroacetic Acid Chemical Reconstruction of Skin Scars.
During treatment, a doctor carefully applies a small amount of high-concentration TCA directly into the base of a depressed acne scar.
The treatment produces a controlled chemical injury within the scar tissue.
This stimulates a wound-healing response and encourages new collagen formation as the area heals.
Over time, repeated collagen remodelling may help make the scar appear shallower and less noticeable.
How does TCA CROSS work?
A small amount of TCA is placed precisely within the depressed scar.
Within seconds, the treated area typically turns white, a reaction commonly referred to as frosting.
This indicates a controlled coagulation of proteins within the treated tissue.
Over the following days, the area heals and may form a small crust or scab.
As the skin repairs itself, collagen production and remodelling occur within the scar.
This process develops gradually over several weeks.
TCA CROSS is therefore not intended to “burn away” a scar. The aim is to stimulate controlled healing within the scar so that its depth and appearance can improve progressively.
Which Acne Scars Respond Best to TCA CROSS?
TCA CROSS is most useful for deep, focal atrophic scars.
ICE-PICK SCARS Ice-pick scars are narrow, deep depressions that extend into the deeper layers of the skin. Because of their depth and small surface opening, they may respond poorly to resurfacing treatments alone. TCA CROSS can target these scars individually and stimulate collagen remodelling within the scar channel.
SELECTED BOXCAR SCARS Some small or deeper boxcar scars may also respond to TCA CROSS. However, broader boxcar scars may require resurfacing, RF microneedling, subcision or other treatments depending on their depth and structure.
ROLLING SCARS Rolling scars are usually caused by fibrous bands tethering the skin downwards. For this scar type, subcision is generally more appropriate when significant tethering is present.
Is TCA CROSS the Same as a Chemical Peel?
No.
Although both treatments may use trichloroacetic acid, they are performed differently and for different purposes.
A chemical peel is generally applied across a larger surface area to improve concerns such as pigmentation, texture or superficial skin ageing.
TCA CROSS is a focal treatment.
The acid is applied only to individual depressed scars using a very small applicator.
This allows treatment to be concentrated within the scar rather than over the surrounding skin.
What Happens During a TCA CROSS Treatment?
Before treatment, the skin is cleansed and the scars to be treated are identified.
A doctor then applies a very small amount of TCA directly into each selected scar.
The treated area typically frosts and turns white within seconds.
Only the individual scars are treated.
The number of scars treated during each session depends on their location, depth and the overall treatment plan.
The procedure itself is usually relatively quick, although treatment time varies according to the number of scars being addressed.
What Happens After TCA CROSS?
Immediately after treatment, the treated scars may appear white due to frosting.
This generally fades within several hours.
The areas may then become:
- red
- mildly swollen
- darker in colour
- slightly tender
- crusted or scabbed
Small scabs usually form over the treated scars during the healing process.
It is important not to pick or remove these scabs prematurely, as doing so may increase the risk of pigmentation or additional scarring.
Can TCA CROSS Be Combined with Other Acne Scar Treatments?
Yes.
Most patients with acne scarring have more than one scar type, so TCA CROSS is often used as part of a combination treatment plan.
Depending on the scars present, treatment may include:
RF MICRONEEDLING To stimulate collagen remodelling and improve broader skin texture.
FRACTIONAL CO2 LASER To resurface uneven skin and improve selected depressed scars.
SUBCISION To release fibrous bands beneath tethered rolling scars.
DERMAL FILLERS For selected depressed scars requiring additional structural support.
Different treatments address different components of acne scarring, which is why a combination approach may be recommended.
Learn more about RF microneedling treatment →
Learn more about Fractional CO2 laser →
Learn more about subcision →
Frequently Asked Questions About TCA CROSS
Benefits
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Targets deep ice-pick and selected boxcar scars -
Treats individual scars precisely
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Helps improve scar depth gradually
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Helps improve scar depth gradually
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Localised treatment with limited surrounding skin involvement
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Can be combined with other acne scar treatments
Best For
People with deep ice-pick scars, selected narrow boxcar scars and other focal depressed acne scars that require more targeted treatment than broad resurfacing alone.
