Procedure

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.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed September 8, 2026
16:9 hero for TCA Peel. Never cropped: the tone strip and the corner logo depend on the full frame.

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TCA is where peels stop being a lunchtime treatment. At medium depth it does more for texture and stubborn sun damage than glycolic or salicylic will, and it asks for a week of your life in return.

What I find myself repeating: the acid is not the risk, the depth is — most of the lasting problems I see come from jumping to a medium peel to chase brown marks on skin that makes pigment easily, and TCA CROSS, for icepick scars, is a different procedure that happens to use the same acid.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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Also calledTrichloroacetic acid peel, TCA
DepthAdjustable. About 10 to 20% is superficial; about 25 to 35% is medium depth. Higher strengths are used only for spot treatment, not across the face
Downtime3 to 5 days at low strength; 7 to 10 days at medium depth
SessionsOne to three at medium depth, months apart. Light TCA can be done as a short course
Typical costAbout $150 to $300 for a light TCA peel in the US, and about $400 to $900 for medium depth
Results timelineSkin looks worse before better. The result shows once peeling finishes, at 1 to 2 weeks
PainSharp stinging and heat for several minutes, and burning that can carry on for an hour after a medium peel
EndpointThe provider watches for frosting, a white film on the skin that shows how deep the acid has gone
Skin tone safetyLight TCA is used on all skin tones. Medium-depth TCA carries a real risk of lasting dark or pale patches on deeper skin tones

What It Is

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A TCA peel is one kind of chemical peel. The chemical peel page covers peels as a group; this page is what is different about trichloroacetic acid. TCA is brushed on in layers and not neutralized. It stops when it has used itself up in the skin. Its range is what sets it apart. Strength, number of layers and how firmly it is pressed in decide the depth. Around 10 to 20% stays in the outer layer. Around 25 to 35% reaches the upper dermis — useful for texture and deeper pigment, and riskier for the same reason. Most practices do not use stronger solutions across the face at all, only in spot treatment such as TCA CROSS, below.

How It Works

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TCA is not a fruit acid. It coagulates protein instead of loosening the glue between dead cells, fixing a controlled layer of tissue that sheds over the following week while new skin forms underneath. Pigment sits in that layer, so brown marks lift with it. At medium depth the healing reaches the upper dermis, so new collagen forms and texture improves.

Frosting is the visible marker — skin turns white as protein coagulates. Light patchy frost means a superficial peel; a solid white sheet over pink means the upper dermis. Providers judge depth by frosting, not a timer, which is why TCA depends more on the operator than glycolic does.

Rinsing does not stop it. Water dilutes what is on the surface but does not undo what has reacted, so layers go on slowly with a pause to watch the skin.

TCA CROSS uses the same acid differently. A high strength goes into the base of a single icepick scar with a wooden applicator, injuring that point so it heals with new collagen and lifts. Surrounding skin is untouched — a scar technique, not a peel.

Skin is about two millimetres thick on the face. How deep a treatment reaches decides what it can change, and whether it treats all of the skin or scattered columns of it decides how long you take to heal.

How it works
Compare
Skin basics
EPIDERMISDERMISFAT0.05 mm — pigment0.5 mm — texture + pores1.0 mm — collagen1.5 mm — deep dermisNEEDLINGNON-ABLATIVE LASERABLATIVE LASERREACHES THE UPPER DERMIS

This reaches just past the epidermis into the top of the dermis, around half a millimetre down. That is where fine texture, pores and the shallowest scarring sit. Deep enough to remodel a little, shallow enough that healing is measured in days. A peel or a scrub takes the skin off evenly from the surface down. Everything above the line goes and nothing below it is touched, which is why peels suit surface pigment and rough texture, and why the whole face flakes for a few days after.

Needles make hundreds of separate channels and leave the skin between them untouched. That untouched skin is what heals the rest, so recovery is quick — but a needle only injures the skin to start repair. It removes nothing.

The light passes through the surface and heats a column underneath it. The surface stays whole, so you leave red rather than raw — and it takes a course of sessions rather than one.

The laser removes columns of skin outright: the white gaps here are tissue that is gone, and new skin grows in from the sides. The strongest of the four, and the longest to heal.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

What It Treats

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Wrinkles and Fine Lines
Wrinkles and Fine Lines
Moderate evidence
A medium-depth peel with good evidence for fine lines, rough texture and sun-related pigment, done in a clinic with about a week of peeling afterwards. The deeper it goes the more it does and the more it risks. On deeper skin tones the strength is kept low and a test area is done first, because dark marks afterwards are common at higher strengths.

Pros and Cons

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Pros
  • Adjustable depth Light freshen-up to medium peel, same acid.
  • Works on stubborn pigment Reaches marks superficial peels leave.
  • Real texture change At medium depth, fine lines and rough skin improve.
  • Fewer sessions A medium peel is usually once, not six.
  • No device needed Covers some laser ground, cheaper.
Cons
  • Real downtime Seven to ten days of redness, darkening and peeling.
  • Highest pigment risk Dark patches common; pale patches can be permanent.
  • Operator-dependent No neutralizer, no timer. Frosting is the only guide.
  • Uncomfortable Medium peels burn, sometimes needing sedation.
  • Not a scar peel Indented scars need TCA CROSS, needling, subcision or laser.

How to Prepare

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4 weeks before2 weeks before1 to 2 days before
Sun and pigment prep
4 weeks before
No tanning or sunburn for a month, or the peel leaves blotchy pigment. On deeper skin tones and with melasma, providers pre-treat 2 to 4 weeks with a pigment-blocking cream.
Actives and hair removal
2 weeks before
Stop waxing, threading and hair removal creams for 2 weeks. Stop retinoids, benzoyl peroxide and exfoliating acids 5 to 7 days before.
Antiviral
1 to 2 days before
Antiviral medicine starts a day or two before a medium peel, whether or not you get cold sores.
Plan ahead
Book a week at home, arrange a ride back, and have ointment, cleanser and sunscreen ready.

What Happens

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ArrivingThe treatmentLeaving
Arriving
Skin is checked and photographed, and antiviral medicine started if it has not been. A light peel needs no numbing beyond cool air. For a medium peel, some providers use oral pain medicine, a sedative, or nerve blocks. Your provider will ask about these things.
The treatment
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.
Leaving
Frosting fades within about 15 to 30 minutes, leaving skin bright red and swollen. After a medium peel you look sunburned and feel tight. That is why people take the week off.

Recovery

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Days 1 to 3Days 3 to 10Weeks 2 to 6
Days 1 to 3
Skin turns brown or bronze and feels stiff and leathery. Alarming to look at, and normal — the treated layer preparing to shed. Swelling peaks around day 2, worst around the eyes. Cool compresses and bland ointment.
Days 3 to 10
Skin cracks and comes away in sheets, often starting at the mouth. Keep it greased and covered. Do not pull, cut or scrub attached sheets; that is how marks and scars happen. Peeling finishes by day 7 to 10, leaving bright pink, tender skin.
Weeks 2 to 6
Pinkness settles over several weeks and takes makeup once skin is intact. Some people get dark patches in weeks 2 to 4. Treatable — report it early.

Aftercare

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7 to 10 days2 to 4 weeks1 month
Makeup and exercise
7 to 10 days
Neither until peeling has finished and skin is unbroken, usually 7 to 10 days. Heat and sweat work against new skin.
Actives
2 to 4 weeks
No retinoids or acids until your provider says so, usually 2 to 4 weeks after a medium peel.
Sun
1 month
Strict avoidance and SPF 30 or higher daily for a month. New skin after TCA burns and pigments very easily.
Ointment
Bland ointment or your barrier cream, reapplied through the day until peeling finishes. Never let skin dry and crack.
Washing
Lukewarm water and a gentle cleanser. No scrubs, washcloths, brushes or steam until new skin is intact.
Picking
None. Loose skin comes away on its own. Pulling attached skin is the main cause of scarring.

Risks

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A light TCA peel behaves like other superficial peels: stinging, redness, a few days of flaking. Risk climbs steeply with depth, and medium-depth TCA carries the highest chance of lasting pigment change of any peel in common use.

Dark patches
New brown or gray patches in the weeks after, most common on deeper skin tones, after sun, and with melasma. Treat early; they clear slower the longer they sit.
Pale patches
Areas that heal lighter than the surrounding skin. These can be permanent, and they are why medium peels are used cautiously on deeper skin tones.
Prolonged redness
Pinkness beyond about 6 weeks, or redness getting worse.
A cold sore outbreak
Worth preventing before a medium peel. Report tingling, clustered blisters or pain early.
Skin that will not close
Any area still raw past about day 10.

In Deeper Skin Tones

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This section matters most on this page. Skin with more pigment answers a controlled injury by making more pigment, so the peel that leaves one person pink for a week leaves another with a brown patch for months. Medium-depth TCA can also leave a pale patch, which is harder to correct.

That does not put TCA off-limits. Light peels are used on all skin tones, and TCA CROSS is used routinely on deeper skin tones with good results because it treats single points, not a whole face. What changes is the decision — providers experienced with deeper skin tones start superficial, pre-treat for weeks with a pigment-blocking cream, test a small area, and reach for medium depth slowly, often choosing a course of lighter peels.

Questions worth asking before booking: how often do you do this on skin like mine, will you test an area first, and what happens if I get a dark patch.

If You Stop

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Stop and reassess if a dark patch appears. Pause further peels, treat the pigment, and do not repeat at the same depth until it clears.

Stop if the skin has not closed by about day 10. Anything still raw then needs looking at.

Do not repeat a medium peel while skin is still pink — it is still remodeling underneath. Most providers want several months between medium peels.

Stop a light TCA course if irritation builds rather than settles between sessions. That is the pattern that ends in pigment problems.

Stop before other treatments on the same area. Leave several weeks before laser, microneedling, waxing or threading, longer after a medium peel.

Stopping is fine at any point. Nothing rebounds and nothing needs tapering; the result you have fades over months and years.

Combining Treatments

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Same day
Retinoid and pigment cream
Standard for several weeks before a medium peel.
Same day
Sunscreen
Restarts once healing has finished.
Same day
Jessner's or glycolic
Often combined so less TCA is needed.
Same day
Scar treatments
TCA CROSS is often combined with subcision, microneedling or laser.
Wait 2–4 weeks
Laser or microneedling
Wait 2 to 4 weeks after a light peel.
Wait 2–4 weeks
Waxing or threading
Wait 2 to 4 weeks after a light peel.
Different visit
Botulinum toxin, filler
Before the peel or well after healing.
Wait 2–3 months
After a medium peel
Nothing else on the area until the pinkness settles.
Wait 6–12 months
Isotretinoin
Most providers want 6 to 12 months after finishing.

Insurance Coverage

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Insurance does not cover peels for pigment, texture or scarring. It sometimes covers peels for precancerous sun damage.

Ask Your Doctor

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If you are pregnant or breastfeeding
Ask the doctor managing your pregnancy or breastfeeding first.
If you have a deeper skin tone
Ask whether a lighter peel or a course suits you better, whether a test area is planned, and the plan if a dark patch appears.
If you have melasma
Medium peels can set melasma off badly — see someone who treats melasma.
If you get cold sores
Say so before booking — antiviral medicine starts a day or two beforehand.
If you have taken isotretinoin
Say so if you finished within the last year — most providers wait 6 to 12 months before a medium peel.
If you have had a keloid scar
Or any thick raised scar. Depth needs a careful conversation.
If your immune system is suppressed
By a medicine you take. Healing is slower.
If you have had radiation to the area
Or a facelift. Reduced blood supply changes how the skin heals.
If you are tanned or have had recent sun
Peeling tanned skin is a direct route to blotchy pigment. Wait.
If your goal is icepick scars
Ask about TCA CROSS, not a face peel, and whether subcision or needling belongs too.

At-Home Versions

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Nothing at TCA strength
Bad alternative
TCA sold online for home peeling comes with no neutralizer and no way to judge depth. Burns, scars and permanent pale patches come from this. There is no home version of this procedure.
Leave-on acids, glycolic 5 to 10% or salicylic 0.5 to 2%
Good alternative
The realistic daily substitute for the surface part of the job. Slower, far cheaper and much safer.
Topical retinoid
Good alternative
The most reliable home treatment for texture, fine lines and post-acne marks, and standard pre-treatment before a peel.
Pigment-blocking creams
Good alternative
For brown patches these do most of the work. A peel speeds the process up rather than replacing them.
Daily sunscreen
Good alternative
The single thing that decides whether a peel result lasts. Skipping it after a TCA peel undoes the peel.

How It Compares

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A gloved hand brushing a clear chemical peel onto the face of a woman lying back with her eyes closed16:9 hero for Glycolic Acid Peel. Never cropped: the tone strip and the corner logo depend on the full frame.
Glycolic acid peel
Different job
Gentler, neutralized on a timer, essentially no downtime. Better for dullness and surface marks and much easier to repeat, with less effect on texture and deeper pigment.
Salicylic acid peel
Different job
Superficial and oil-soluble, aimed at active acne rather than sun damage or texture. Very low risk, and correspondingly limited depth.
Fractional laser resurfacing
Better
Similar territory to a medium peel for texture and lines, with more precise depth control and often a better safety margin on deeper skin tones. Costs more and needs a device.
MicroneedlingDiagram: how Microneedling works in the skin
Microneedling
Different job
Reaches indented scars and texture with far less pigment risk, but does much less for sun spots and surface pigment. Often combined with TCA CROSS rather than chosen instead of it.
SubcisionDiagram: how Subcision works in the skin
Subcision
Different job
For tethered rolling scars specifically, releasing the bands underneath. It does nothing for pigment and pairs with scar-directed TCA rather than replacing it.
Topical retinoid plus pigment cream
Different job
Used at home, it is slower and cheaper, and needed either way to hold a peel result. For mild pigment this is often enough on its own.

Finding a Provider

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In most US states a medium-depth TCA peel is physician-level: a dermatologist or plastic surgeon, or a physician assistant or nurse practitioner working with one. Light peels are more widely permitted, and rules vary by state. TCA CROSS should be done by someone who does it regularly — the technique is precise and the acid is strong.

Ask what percentage is used, whether it is combined with Jessner's or a glycolic prep, how many they do a month, and for before-and-after photographs of people with your skin tone. Ask what happens if you develop a dark patch.

Red flags: a medium peel with no consultation or pre-treatment, no antiviral cover, no photographs, an unnamed "proprietary" formula, a promise to remove indented scars with a face peel, and any suggestion you buy TCA and do it yourself.

Myths

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  • "TCA is just a stronger glycolic peel." Different acid, different mechanism. Glycolic loosens the bonds between dead cells and is neutralized on a timer. TCA coagulates protein and is judged by frosting.
  • "Frosting means something has gone wrong." Frosting is the intended endpoint and how the provider reads depth. No frost means the peel was superficial.
  • "A TCA peel removes acne scars." A face peel does not lift indented scars. TCA CROSS places high-strength acid into individual icepick scars — different procedure, different purpose.
  • "You can do TCA at home if you buy a low percentage." No neutralizer, and no reliable way to judge depth without training. Home use is where the burns and permanent pale patches come from.
  • "More peeling means better results." How much skin comes off is not the measure. The depth of the reaction is, and that was decided during the appointment.

Questions Patients Ask

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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.

References

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