Subcision vs TCA Peel

Subcision: A needle passed under an indented acne scar to cut the strands holding it down, so the surface can lift. It is aimed at rolling scars specifically, it bruises, and it is almost always combined with something else.

TCA Peel: A chemical peel using trichloroacetic acid. Depending on the strength it is either a light peel with a few days of flaking or a medium peel with a week of visible healing. It carries the highest pigment risk of the peels in common use.

Reviewed by Dr. Schwarz, Board-Certified Dermatologist
Last updated: 10/22/2026

Editorial illustration for Subcision, based on the entry’s treatment or equipment reference.

Editorial illustration for TCA Peel, based on the entry’s treatment or equipment reference.

Choose if Key differences What is it?What it treats Treatment areas Skin tones How it works Before your treatment Day of treatment After your treatment Risks Cost Questions Related

Choose Subcision if…

Choose for rolling acne scars that are tethered down, usually combined with needling, laser or filler.

Soft, wavy rolling scars
Scars that improve when you stretch the skin
You can hide a week or two of bruising

Choose TCA Peel if…

Choose for ice pick scars (as TCA CROSS) or stronger sun-damage peeling — the highest pigment risk of the common peels.

Deep, narrow ice pick scars
Sun spots and fine lines on lighter skin
You can take a week of peeling

Often combined

Can you have both?

They treat different scar types: subcision for rolling scars, TCA CROSS for ice pick scars. Often used in the same plan, spaced weeks apart.

Key differences

● Subcision

● TCA Peel

DowntimeNone → 2+ weeks

1–2 weeks

3–7 days

PainMinimal → Needs anesthesia or sedation

Moderate

Results showImmediately → 3+ months

1–3 months

1–4 weeks

How long it lastsWeeks → Years or permanent

Years or permanent

1–2 years

Visits neededOne → Every few months

A short series (2–3)

Cost per visit$ → $$$$$

ReversibleYes, can be undone → No, permanent

No, permanent

What is it?

Subcision

TCA Peel

What is it?

It releases scar bands.

Fibrous bands tethering depressed scars are cut beneath the skin.

It suits rolling acne scars.

It is not for every pit, mark or raised scar.

It is minor surgery.

It is performed by a clinician with a needle or blade.

History is reviewed.

Bleeding risk, scarring tendency and isotretinoin use are assessed.

It is a chemical peel.

Trichloroacetic acid removes selected layers of skin.

Depth varies.

Formulation, application and technique set the depth.

It is not a home treatment.

Online acid products should not be used to copy it.

History matters.

Pigment-prone skin, herpes and scarring history need assessment.

What it treats

Evidence level

Subcision

TCA Peel

Strong evidenceMost established uses

Rolling Scars

Releases tethered scars.

Ice Pick Scars

TCA CROSS raises deep pits.

Moderate evidenceSome supportive research

Acne Scarring

Best for rolling scars.

Educational illustration of natural shallow dimpling of adult lateral-thigh skin below the hem of shorts on light skin.

Cellulite

Releases dimples.

Sun Spots

Clears spots.

A relaxed forehead with faint shallow horizontal fine lines.

Wrinkles and Fine Lines

Medium peels smooth lines.

Actinic Keratosis

Removes sun damage.

Little evidence

Educational illustration of healed broad indented scars with defined edges on the left cheek, with the face turned to the person’s right on light skin.

Boxcar Scars

Better treated with resurfacing.

—

Not effective

Ice Pick Scars

Too narrow to release.

—

Can make it worse

—

Flat tan patches with soft irregular edges across the forehead and upper cheek of an adult with light skin, the surface completely smooth.

Melasma

Deep peels can darken patches.

Redness and fine superficial vessels across a light-skinned cheek and nose.

Rosacea

Very irritating.

Treatment areas

Selected facial scars; the highlighted cheeks show the general treatment area.

Face; the selected area depends on the concern and treatment plan.

Skin tones

Skin tone

● Subcision

● TCA Peel

Lighter skin

Low risk

Bruising.

Low risk

A week of peeling for medium depth.

Medium skin

Low risk

Bruising may leave brief dark marks.

Some risk

Dark marks are common; pre-treatment helps.

Deeper skin

Low risk

One of the lower pigment-risk scar treatments.

Higher risk

Highest pigment risk of common peels; spot TCA CROSS is safer than full-face.

How it works

Subcision

TCA Peel

How it works

Subcision mechanism diagram. A scar is tethered below skin: Fibrous bands can pull a rolling scar downward. The bands are released: A clinician passes an instrument beneath the scar. Repair follows the release: The depression may improve as the tissue heals and remodels.

TCA Peel mechanism diagram. TCA is applied to selected skin: A clinician chooses the formulation and treatment plan. A controlled injury forms: The acid coagulates proteins in the treated layers. Skin heals and renews: The response depends on peel depth, technique, and skin.

Diagram explanation

A scar is tethered below skin: Fibrous bands can pull a rolling scar downward. The bands are released: A clinician passes an instrument beneath the scar. Repair follows the release: The depression may improve as the tissue heals and remodels.

Schematic illustration. Technique and response vary. This explains a mechanism and does not specify treatment settings.

TCA is applied to selected skin: A clinician chooses the formulation and treatment plan. A controlled injury forms: The acid coagulates proteins in the treated layers. Skin heals and renews: The response depends on peel depth, technique, and skin.

Schematic illustration. Technique and response vary. This explains a mechanism and does not specify treatment settings.

Before your treatment

Subcision

TCA Peel

Earlier planning

6 months before: After isotretinoin: Most providers wait about 6 months before subcision, though this is debated and some treat sooner.

Not specified

2–4 weeks before

2 weeks before: Sun: Keep the area out of the sun and use SPF 30 or higher.

Before you book: Timing: Get active acne under control first, or new scars form beside the treated ones.

4 weeks before: Sun and pigment prep: No tanning or sunburn for a month, or the peel leaves blotchy pigment.

4 weeks before: Sun and pigment prep: On deeper skin tones and with melasma, providers pre-treat 2 to 4 weeks with a pigment-blocking cream.

2 weeks before: Actives and hair removal: Stop retinoids, benzoyl peroxide and exfoliating acids 5 to 7 days before.

2 weeks before: Actives and hair removal: Stop waxing, threading and hair removal creams for 2 weeks.

The week before

Actives and supplements: With your prescriber's agreement, stop blood-thinning supplements such as fish oil, vitamin E and ginkgo.

1 to 2 days before: Antiviral: Antiviral medicine starts a day or two before a medium peel, whether or not you get cold sores.

Day of treatment

Subcision

TCA Peel

Arrival & prep

Photographs first, then the skin is stretched and lit from the side so tethered scars stand out.

Skin is checked and photographed, and antiviral medicine started if it has not been.

Treatment

A tiny entry point is made beside the scar, and the needle or cannula is passed underneath and moved side to side in a fan until the skin releases.

You feel pressure, tugging and a faint crunching as the strands give way. Firm pressure follows to limit bruising, and filler or microneedling may follow. Usually 15 to 45 minutes, and once numb it is pressure, not pain.

Skin is cleaned and degreased, eyes and lips protected.

The acid goes on with gauze or a brush, section by section, each area watched for frosting before the next layer. No neutralizing step; cool compresses follow. A light peel takes about 20 minutes, a medium 30 to 45. Medium TCA is genuinely uncomfortable, worst early.

Before you leave

Swollen, red and firm, with the treated scars looking temporarily better from the swelling.

Frosting fades within about 15 to 30 minutes, leaving skin bright red and swollen.

After your treatment

Subcision

TCA Peel

First 24 hours

Days 1 to 3: Deep purple bruising appears and spreads downward with gravity, worst around day two or three.

Days 1 to 3: Skin turns brown or bronze and feels stiff and leathery.

Days 2–7

Days 4 to 14: The bruises turn green and yellow, and concealer covers them reasonably well from about day three, once the entry points have sealed.

Days 3 to 10: Skin cracks and comes away in sheets, often starting at the mouth.

Weeks 2–4

Weeks 2 to 12: Small firm lumps can be felt as the scar tissue remodels, and most soften on their own.

Weeks 2 to 6: Pinkness settles over several weeks and takes makeup once skin is intact.

Time to results

1–3 months

1–2 weeks after peeling

How long results last

Long-lasting

Months to years

Risks

A firm lump that is growing
Bruising that keeps expanding
A new brown mark
A cold sore outbreak
A scar that looks deeper afterward

A light TCA peel behaves like other superficial peels
Dark patches
Pale patches
Prolonged redness
A cold sore outbreak
Skin that will not close

Cost

Per session

In the US, subcision commonly runs a few hundred dollars per session, and the price rises when filler, microneedling or radiofrequency needling is added — filler is often the larger part of the bill.

In the US a light TCA peel runs about $150 to $300 a session and a medium peel about $400 to $900, more for a full face with sedation.

Insurance

Insurance almost never covers subcision for acne scars, because scar treatment for appearance is cosmetic.

Insurance does not cover peels for pigment, texture or scarring.

Questions

Subcision

TCA Peel

Individual Questions

How do I know if my scars are the right type?

Stretch the skin either side of the scar, or press gently beside it. If the dip flattens out, it is tethered, and that is the scar subcision treats. Scars with sharp punched-out edges that stay put when you stretch are icepick or boxcar scars and need something else.

How long does the bruising last?

Usually 7 to 14 days. It looks worst around day two or three, then turns green and yellow, and concealer works from about day three. Plan for two clear weeks, not one.

Will one session be enough?

Usually not. Most courses are 2 to 4 sessions, 4 to 8 weeks apart. Some of the immediate improvement is lost as cut strands reattach, and the gain builds over the course.

Do I need filler with it?

Not always, but many providers add it. Filler holds the released space open while new collagen forms, which reduces retethering. Ask what would be used, how much, and what it adds to the cost.

Does it hurt?

The numbing injections sting for a few seconds and are the worst part. After that it is pressure and tugging, not sharp pain. The area is sore for a day or two, like a deep bruise.

Is it safe on deeper skin tones?

Yes, and it is often a good choice, because it uses no heat or light. The thing to manage is a temporary brown mark where the bruising was. Sun protection, limiting the bruising and spacing sessions all help.

What is frosting?

The white film that appears as TCA coagulates protein. It is the intended endpoint and how the provider judges depth. Patchy frost means a superficial peel; a solid white sheet means the upper dermis.

How is TCA CROSS different from a TCA peel?

Same acid, different procedure. TCA CROSS places a high strength into the base of individual icepick scars and leaves the rest of the skin alone. A peel treats the whole area at much lower strength. If icepick scars are why you are going, ask for TCA CROSS by name.

How much downtime should I plan for?

About 3 to 5 days for a light peel, 7 to 10 for a medium one, plus several weeks of fading pinkness. Plan the week off before you book.

Is TCA safe on deeper skin tones?

Light TCA and TCA CROSS are used on all skin tones. Medium-depth TCA across the face risks lasting dark or pale patches on deeper skin tones, so many providers choose a course of lighter peels instead.

Why is there no neutralizer?

TCA is used up as it reacts, so it stops on its own. Water rinses the surface but does not undo the reaction underneath. That is why it goes on in slow layers and is judged by frosting.

Will it get rid of my acne scars?

A face peel improves discoloration and texture but does not lift indented scars. Icepick scars may respond to TCA CROSS; rolling and boxcar scars usually need subcision, needling or laser.

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