TCA Chemical Peel: Strengths, Depth, What the Studies Show and the Risks
Start with our pillar guide: Dermal Fillers for Ozempic Face: What the Evidence Shows (and Doesn't), or browse all Aesthetic Treatments articles.
A TCA chemical peel is an in-office peel using trichloroacetic acid, at superficial or medium depth. In small trials, it improved sun damage, acne scars and melasma, but often didn't beat glycolic or salicylic acid peels, could be less comfortable, and melasma often returned within 12 weeks. Deeper peels bring bigger results and more complications.
Evidence: Limited.
Looking at injectables rather than peels? Our pillar guide to dermal fillers for Ozempic face covers those treatments.
Key takeaways
- A 2019 review in the Journal of the American Academy of Dermatology says peel depth is "directly related" to both better results and the number of complications (Lee et al., 2019).
- In a 30-patient split-face study, 30% TCA cut acne scar scores from 13.20 to 6.83, while 70% glycolic acid cut them from 12.67 to 8.97 (Manjhi et al., 2024).
- A 2020 meta-analysis (13 studies, 478 patients with darker skin across all peel comparisons) favored glycolic acid over TCA for melasma, and TCA over topical hydroquinone (Dorgham et al., 2020).
- A 40-patient records review reported that melasma recurrence reached 70% by week 12 after treatment stopped (Maruma et al., 2025).
- In a 28-patient actinic keratosis trial, scarring occurred in 6 patients (21%) and only with 35% TCA (Holzer et al., 2017).
- In an uncontrolled 30-patient series, 73.3% had more than 70% improvement in ice-pick scars after 100% TCA CROSS (Khunger et al., 2011).
What is a TCA chemical peel?
A TCA chemical peel is a clinic procedure that applies trichloroacetic acid to the skin, usually at superficial or medium depth. The main trade-off is depth: going deeper is linked to both better results and more complications.
That depth rule comes from a narrative review by 7 authors (writing with the International Peeling Society), whose abstract gives no figures (Lee et al., 2019). Funding is not stated in PubMed. A separate review by 3 authors at private Spanish clinics says TCA's adverse effects "have for a long time been a major limitation" (Truchuelo et al., 2017). It gives no figures either, and its funding is not stated in PubMed.
In the abstracts we reviewed, TCA peels were tested for sun damage, acne scars, melasma, active acne and actinic keratosis. Evidence: Limited; both sources here are narrative reviews.
TCA chemical peel strengths: what do 15%, 25%, 35% and 100% mean?
The percentage is the TCA concentration a study used, and studies in our sources ran from 10% to 100%. This table records what was tested. It isn't a guide to choosing a strength.
| Strength | How it was used | Studied for | Source |
|---|---|---|---|
| 10% and 20% | Spot peel after a 35% glycolic acid full-face peel | Melasma | Garg et al., 2019 |
| 15% | Alone, on one cheek, single session | Melasma | Hong et al., 2012 |
| 15% | Combined with 70% glycolic acid | Sun-damaged facial skin | Kubiak et al., 2020 |
| 25% | Alone | Mild-to-moderate acne | Dayal et al., 2021 |
| 25% | With or without microneedling | Melasma | Hofny et al., 2023 |
| 30% | Alone, on one side of the face | Atrophic acne scars | Manjhi et al., 2024 |
| 35% | Alone | Sun-damaged facial skin | Kubiak et al., 2020 |
| 35% | Alone | Actinic keratosis (medical trial) | Holzer et al., 2017 |
| 70% | Spot CROSS | Atrophic acne scars | Agarwal et al., 2015 |
| 100% | Spot CROSS | Ice-pick and boxcar acne scars | Khunger et al., 2011; Veenstra et al., 2021 |
The abstracts we reviewed give no chart matching each percentage to a depth. Hong describes 15% TCA as medium depth, and Kubiak calls both 15% TCA plus 70% glycolic acid and 35% TCA alone medium-depth peels.
Strength also matters for safety. A 2026 review of TCA CROSS found that "higher TCA concentrations increased the risk of complications" (Stratman and He, 2026). That finding covers spot treatment of scars, not full-face peels. Evidence: Limited.
Does a TCA chemical peel work for sun damage and wrinkles?
A TCA chemical peel improved sun-damaged skin in one 40-woman trial, but the evidence is thin. The same trial concluded that 35% TCA reduced wrinkles more than a combination peel, at the cost of lower tolerability.
Kubiak and colleagues divided 40 women with Glogau II to III photoaging, a measure of sun-related skin aging, into 2 groups of 20 (Kubiak et al., 2020). One group had 35% TCA and the other had 70% glycolic acid plus 15% TCA, for 5 sessions 14 days apart. Skin was measured 3 months after the last session. Randomization is not stated, and funding is not stated in PubMed.
Both groups improved in elasticity, hydration, melanin and redness. The groups differed significantly only on hydration and melanin, which favored the combination, and participants' perceived improvement didn't differ significantly. The abstract's conclusion favors 35% TCA for wrinkles, but it gives no wrinkle figures to show the size of that difference. Neither group had adverse events that needed intervention or stopped treatment.
The only other 35% TCA trial here shows the limits of the peel, but it wasn't a cosmetic study. This randomized, observer-blinded trial treated actinic keratosis, a medical skin condition, in 28 patients for 12 months of follow-up (Holzer et al., 2017). TCA reduced lesion counts by 31%, vs 58% with aminolaevulinic acid photodynamic therapy (P = 0.006), and scarring occurred only with TCA. Funding is not stated in PubMed. Evidence: Limited; one cosmetic trial.
Does a TCA peel help acne scars, and what is TCA CROSS for ice-pick scars?
A 30% TCA peel beat 70% glycolic acid in one 30-patient split-face study of atrophic (sunken) acne scars. TCA CROSS, a spot technique for individual scars, has support from uncontrolled series and a 2026 review.
Manjhi and colleagues treated each side of the face differently, with 4 sessions every 4 weeks and 16 weeks of assessment (Manjhi et al., 2024). Scores on a global acne scarring scale fell from 13.20 to 6.83 with TCA and from 12.67 to 8.97 with glycolic acid (P = 0.003). Physician and patient ratings also favored TCA. Dryness and crusting were more common on the TCA side. The authors report no conflicts, randomization is not stated, and funding is not stated in PubMed.
CROSS stands for chemical reconstruction of skin scars. It places high-strength TCA on individual scars to prompt new collagen, rather than peeling the whole face. The evidence below is mostly uncontrolled, so it can't show how much of the improvement came from the treatment itself.
| Khunger et al., J Cosmet Dermatol, 2011 | 30 | 4 sessions, 2 weeks apart | 100% TCA CROSS | Excellent (>70%) improvement in 73.3%, good in 20%, fair in 6.7% |
| Agarwal et al., Dermatol Surg, 2015 | 53 | Every 2 weeks; 3-month follow-up | 70% TCA CROSS | Good or excellent (>50%) improvement in 66%; 81.1% very satisfied or satisfied |
| Stratman and He, J Clin Aesthet Dermatol, 2026 | 937 across 34 publications | Not reported in abstract | TCA CROSS, varied | Improvement rates of 50% to 80%; higher concentrations raised complication risk |
| Veenstra et al., J Clin Aesthet Dermatol, 2021 | 1 | Assessed 2 months after the micropipette session | 100% TCA CROSS | Micropipette delivery led to more prominent scars, redness and atrophy |
Khunger et al., J Cosmet Dermatol, 2011
Result: Excellent (>70%) improvement in 73.3%, good in 20%, fair in 6.7%
Uncontrolled series of ice-pick scars in skin types IV and V. Priming with hydroquinone and tretinoin was part of the study method. Funding not stated in PubMed. Evidence: Early / preliminary.
Agarwal et al., Dermatol Surg, 2015
Result: Good or excellent (>50%) improvement in 66%; 81.1% very satisfied or satisfied
Uncontrolled series of atrophic acne scars. Results were better with boxcar scars and more severe scars. Funding not stated in PubMed. Evidence: Early / preliminary.
Stratman and He, J Clin Aesthet Dermatol, 2026
Result: Improvement rates of 50% to 80%; higher concentrations raised complication risk
Review, not a meta-analysis, covering Fitzpatrick skin types I to V. Authors report no relevant conflicts; funding not stated in PubMed. Evidence: Limited.
Veenstra et al., J Clin Aesthet Dermatol, 2021
Result: Micropipette delivery led to more prominent scars, redness and atrophy
Case report. A later 30-gauge needle treatment brought improvement. No funding and no conflicts reported. Evidence: Early / preliminary.
Khunger, Agarwal and Veenstra had no control group. Stratman and He summarize mixed study types.
The Agarwal series covered atrophic scars generally and did best in boxcar scars, so its figures aren't specific to ice-pick scars (Agarwal et al., 2015). Khunger is the ice-pick-specific series here. The Veenstra case is a caution: one 46-year-old man improved after 6 needle-delivered treatments, then worsened after a single micropipette session, which the authors link to less precise application (Veenstra et al., 2021). Evidence: Limited.
Does a TCA chemical peel work for melasma and hyperpigmentation?
A TCA chemical peel can lighten melasma, a chronic form of skin hyperpigmentation, but the results didn't last in the studies we reviewed. Glycolic acid also outperformed TCA in a meta-analysis of darker skin.
Searches for chemical peel hyperpigmentation often mix 2 questions: whether a peel fades dark patches and whether it can cause them. This section covers the first, and the risks section covers the second.
The largest source is a systematic review and meta-analysis of 10 randomized trials and 3 prospective comparative studies, with 478 patients with darker skin across all peel comparisons (Dorgham et al., 2020). On the melasma area and severity index (MASI), a melasma severity score, glycolic acid beat TCA (mean difference −1.89, 95% CI −3.26 to −0.52, P = .007). TCA beat topical hydroquinone (mean difference −5.30, 95% CI −6.41 to −4.19, P < .001). Funding is not stated in PubMed.
Recurrence is the main problem:
- Split-face laser comparison: 18 Korean women with skin types III to IV had 15% TCA on one cheek and a 1550-nm fractional laser on the other, once. Both sides improved at 4 weeks with no difference between them, but "melasma recurred at 12 weeks" (Hong et al., 2012). PubMed tags this trial "Research Support, Non-U.S. Gov't," and the funder is not named.
- Records review: 40 patients, 31 of them skin type V, had glycolic acid followed by TCA. Scores improved at 12 weeks (P = .032), yet recurrence "reached 70% by week 12 after treatment cessation" (Maruma et al., 2025). The authors report no conflicts, and funding is not stated in PubMed. Because the peels were sequential, this isn't a result for TCA alone.
Two randomized trials tested add-ons. Adding a 10% or 20% TCA spot peel to a 35% glycolic acid peel gave no significant added benefit across 3 arms of 10 patients, with 4 peels 15 days apart (Garg et al., 2019). The glycolic-only group had the fewest side effects.
In 40 women, adding monthly microneedling to 25% TCA every 2 weeks produced a higher percentage change at 1 and 3 months than TCA alone (p < .05) (Hofny et al., 2023). Funding is not stated in PubMed for either trial.
Other options for dark patches are covered in our guides to tranexamic acid for skin and vitamin C for hyperpigmentation. Evidence: Limited for short-term lightening and for how long results last.
Does a TCA peel work for acne?
A 25% TCA peel worked about as well as a 30% salicylic acid peel for mild-to-moderate acne in one small randomized trial. Salicylic acid was better tolerated.
Dayal and colleagues randomized 2 groups of 25 patients to peels every 2 weeks for 12 weeks (Dayal et al., 2021). Lesion counts and acne scores fell in both groups, with no significant difference between them. No serious adverse effects occurred, but more patients in the TCA group reported burning and stinging. The authors report no conflicts, and funding is not stated in PubMed. Evidence: Limited; one small trial.
How did TCA do in head-to-head comparisons?
TCA's record against other treatments is mixed. It led for acne scars and against hydroquinone, matched salicylic acid and laser, and trailed glycolic acid for melasma and photodynamic therapy for actinic keratosis.
| Comparison | Design / n | Result | Tolerability | Funding |
|---|---|---|---|---|
| 30% TCA vs 70% glycolic, acne scars (Manjhi) | Split-face, 30; randomization not stated | TCA better (6.83 vs 8.97 final score, P = 0.003) | More dryness and crusting with TCA | Not stated in PubMed; no conflicts reported |
| 25% TCA vs 30% salicylic, acne (Dayal) | Randomized, 50 | Equivalent | More burning and stinging with TCA | Not stated in PubMed; no conflicts reported |
| 35% TCA vs 70% glycolic + 15% TCA, sun damage (Kubiak) | Comparative, 40; randomization not stated | Combination better on hydration and melanin; authors favor 35% TCA for wrinkles | Lower tolerability with 35% TCA | Not stated in PubMed |
| 35% TCA vs ALA photodynamic therapy, actinic keratosis (Holzer) | Intrapatient RCT, 28 | Therapy better (lesions down 58% vs 31%) | Less pain with TCA (5.1 vs 7.5), but scarring only with TCA | Not stated in PubMed |
| TCA vs glycolic, melasma (Dorgham) | Meta-analysis, 478 overall | Glycolic better | Not reported in abstract | Not stated in PubMed |
| TCA vs topical hydroquinone, melasma (Dorgham) | Meta-analysis, 478 overall | TCA better | Not reported in abstract | Not stated in PubMed |
| 15% TCA vs 1550-nm laser, melasma (Hong) | Randomized split-face, 18 | No difference; recurrence at 12 weeks | PIH in 28% overall at 4 weeks; no difference between arms | Non-US-government tag; funder not named |
| 35% glycolic vs glycolic + 10% or 20% TCA spot, melasma (Garg) | RCT, 30 | No significant difference | Fewest side effects with glycolic alone | Not stated in PubMed |
| 25% TCA alone vs TCA + microneedling, melasma (Hofny) | RCT, 40 women | Combination better at 1 and 3 months | No rates in abstract | Not stated in PubMed |
What are the risks and side effects of a TCA chemical peel?
Reported risks of a TCA chemical peel include post-inflammatory hyperpigmentation (PIH, dark marks after skin inflammation), dryness, crusting, burning and scarring. Rates vary widely by study, strength and condition treated.
- Dark or light marks: PIH appeared on both the TCA and glycolic sides in Manjhi. In Hong, it affected 28% of patients at 4 weeks, with no split reported by treatment side, and resolved in all but 1 by 12 weeks. Khunger reported transient hyperpigmentation in 2 patients and hypopigmentation in 1.
- Dryness, crusting and burning: Dryness and crusting were more common with 30% TCA (Manjhi et al., 2024), and burning and stinging with 25% TCA (Dayal et al., 2021).
- Irritation and cracking: With sequential glycolic acid and TCA, irritation affected 77.5%, post-peel cracking 62.5% and transient hyperpigmentation 12.5% (Maruma et al., 2025).
- Scarring: Scarring affected 6 of 28 patients (21%) in the actinic keratosis trial (Holzer et al., 2017). Khunger and Maruma reported none, and Veenstra describes one case of worsened scars.
The CROSS review lists transient postinflammatory pigment changes as the most common adverse events (Stratman and He, 2026).
Darker skin has data, but with caveats. Dorgham, Khunger and Maruma all studied darker skin types, yet Maruma notes that TCA above 30% has been "inadequately studied in darker skin phototypes" because of potential complications. Stratman and He also call for more data "across diverse skin types."
Have it done by a dermatologist or trained clinician, and ask about the risks for your skin type. This is expert opinion: no study in the abstracts we reviewed compares outcomes by who performs the peel. Evidence: Limited.
At-home TCA peels: what did we find?
We found no study of at-home TCA use in the abstracts we reviewed. Any claim that home use is safe or effective is unsupported by the sources on this page.
Our PubMed search, run on 2026-11-02, was trichloroacetic acid AND (home OR self-applied OR self-administered OR over-the-counter) AND (peel OR peeling). It returned 5 records, and none tests at-home TCA use. By title, they were an in-office biostimulator paper, an in-office TCA peel product study, a COVID cosmetics letter, a melasma case series and a hand-rejuvenation paper. One search can miss papers, so this describes what we reviewed and not all research.
The risk findings on this page don't test home use either, but they do point to why strength and depth matter. Depth tracks with complications (Lee et al., 2019), and higher concentrations raised complication risk in CROSS (Stratman and He, 2026). The Veenstra case report, by authors at a hospital dermatology department, also describes scars worsening after a change in applicator. Evidence: None found in the abstracts we reviewed; the clinician advice is expert opinion.
What to expect afterward
Recovery has its own guides, so this page stays on the evidence for the peel itself. See our guide to chemical peel aftercare for the routine, and our guide to peeling after a chemical peel for what's normal.
Where the evidence stops
- Small studies. In the abstracts we reviewed, individual studies enrolled 18 to 53 patients, mostly at single centers and mainly in India, Egypt, Korea and Poland. Kubiak and Manjhi don't state randomization.
- Short-lived melasma results. Melasma came back by 12 weeks in Hong and Maruma, and the abstracts we reviewed show no lasting result.
- No at-home data. We found no study of at-home TCA use in the abstracts we reviewed.
- Short follow-up. Among the abstracts we reviewed, only the actinic keratosis trial reports 12 months of follow-up.
- Limited funding detail. Funding is not stated in PubMed for most of these studies. No record we reviewed shows a company sponsor, but a missing statement doesn't rule out industry ties.
- Darker skin at higher strengths. TCA above 30% remains "inadequately studied" in darker skin phototypes, according to Maruma.
FAQ
What is a TCA peel?
A TCA peel is a chemical peel that uses trichloroacetic acid, usually done in a clinic at superficial or medium depth. A 2019 review says deeper peels are linked to better results and more complications.
Does a TCA peel work for acne scars?
In a 30-patient split-face study, acne scar scores fell from 13.20 to 6.83 on the 30% TCA side and from 12.67 to 8.97 on the 70% glycolic acid side. Dryness and crusting were more common on the TCA side. This is a single small study, and its abstract doesn't state randomization.
What is TCA CROSS?
TCA CROSS, or chemical reconstruction of skin scars, applies high-strength TCA to individual scars rather than the whole face. In an uncontrolled 30-patient series of ice-pick scars in skin types IV and V, 73.3% had more than 70% improvement. A 2026 review reported improvement rates of 50% to 80%.
Does a TCA peel get rid of melasma?
A TCA peel can lighten melasma, but it often came back in the studies we reviewed. Melasma recurred by 12 weeks in an 18-patient split-face trial, and a 40-patient records review reported 70% recurrence by week 12 after treatment stopped.
Is a TCA peel better than a glycolic acid peel?
Not consistently. A 2020 meta-analysis in darker skin favored glycolic acid over TCA for melasma, while a 2024 split-face study of 30 patients favored 30% TCA over 70% glycolic acid for atrophic acne scars.
What are the risks of a TCA peel?
The studies we reviewed report post-inflammatory hyperpigmentation, dryness, crusting, burning and, less often, scarring. In an actinic keratosis trial of 28 patients, scarring occurred in 6 patients (21%) and only with TCA. A 2026 review of TCA CROSS found that higher concentrations increased complication risk.
Is a TCA peel safe for darker skin?
Studies in darker skin types exist, but a 2025 paper says TCA above 30% has been inadequately studied in darker skin phototypes. That leaves real gaps, so ask a dermatologist experienced in skin of color about your own risks.
Can I do a TCA peel at home?
We found no study of at-home TCA use in the abstracts we reviewed. Peel depth is tied to both results and complications, so expert opinion is to have a TCA peel done by a dermatologist or trained clinician.
References
- Lee et al. Basic chemical peeling: Superficial and medium-depth peels. J Am Acad Dermatol. 2019. Narrative review, 7 authors (writing with the International Peeling Society); funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/30550830/
- Truchuelo et al. Chemical Peeling: A Useful Tool in the Office. Actas Dermosifiliogr. 2017. Narrative review, 3 authors at private clinics; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/27931952/
- Kubiak et al. Comparative study of 15% trichloroacetic acid peel combined with 70% glycolic acid and 35% trichloroacetic acid peel for the treatment of photodamaged facial skin in aging women. J Cosmet Dermatol. 2020. Comparative trial, n=40, randomization not stated; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/31603267/
- Holzer et al. Randomized controlled trial comparing 35% trichloroacetic acid peel and 5-aminolaevulinic acid photodynamic therapy for treating multiple actinic keratosis. Br J Dermatol. 2017. Medical (actinic keratosis) intrapatient RCT, n=28, 12-month follow-up; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/28012181/
- Manjhi et al. A comparative study of 70% glycolic acid and 30% trichloroacetic acid peel in the treatment of facial atrophic acne scars: A split-face study. J Cutan Aesthet Surg. 2024. Split-face study, n=30, 16 weeks, randomization not stated; no conflicts reported; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/39483653/
- Dayal et al. Efficacy and Safety of 25% Trichloroacetic Acid Peel Versus 30% Salicylic Acid Peel in Mild-to-Moderate Acne Vulgaris: A Comparative Study. Dermatol Pract Concept. 2021. Randomized study, 2 groups of 25, 12 weeks; no conflicts reported; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/34123563/
- Khunger et al. Evaluation of CROSS technique with 100% TCA in the management of ice pick acne scars in darker skin types. J Cosmet Dermatol. 2011. Uncontrolled case series, n=30; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/21332915/
- Agarwal et al. Therapeutic response of 70% trichloroacetic acid CROSS in atrophic acne scars. Dermatol Surg. 2015. Uncontrolled series, n=53, 3-month follow-up; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/25899884/
- Stratman and He. The Use of Chemical Reconstruction of Skin Scars (CROSS) Method With Trichloroacetic Acid (TCA) for Atrophic Scars: A Comprehensive Review on Application Techniques, Adjunct Therapies, and Complications. J Clin Aesthet Dermatol. 2026. Review of 34 publications, 937 patients; no relevant conflicts reported; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/42482854/
- Veenstra et al. Worsening of Acne Scars from Trichloroacetic Acid CROSS Delivered via Micropipette: A Case Report. J Clin Aesthet Dermatol. 2021. Case report, n=1; no funding and no conflicts reported. https://pubmed.ncbi.nlm.nih.gov/34055188/
- Dorgham et al. Efficacy and tolerability of chemical peeling as a single agent for melasma in dark-skinned patients: A systematic review and meta-analysis of comparative trials. J Cosmet Dermatol. 2020. Systematic review and meta-analysis, 13 studies, 478 patients; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/32947652/
- Hong et al. Split-face comparative study of 1550 nm fractional photothermolysis and trichloroacetic acid 15% chemical peeling for facial melasma in Asian skin. J Cosmet Laser Ther. 2012. Randomized split-face trial, n=18, 12 weeks; PubMed tag "Research Support, Non-U.S. Gov't," funder not named. https://pubmed.ncbi.nlm.nih.gov/22372386/
- Garg et al. Comparative Efficacy of a 35% Glycolic Acid Peel Alone or in Combination With a 10% and 20% Trichloroacetic Acid Spot Peel for Melasma: A Randomized Control Trial. Dermatol Surg. 2019. RCT, n=30, 3 arms; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/31464703/
- Hofny et al. Trichloroacetic Acid With Microneedling Versus Trichloroacetic Acid Alone for Treating Melasma. Dermatol Surg. 2023. RCT, n=40; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/36533799/
- Maruma et al. The effects and safety of sequential high concentration glycolic acid and trichloroacetic acid chemical peels in skin photo-type IV-VI, a retrospective cross-sectional monocentric review. Int J Womens Dermatol. 2025. Retrospective single-center records review, n=40; no conflicts reported; funding not stated in PubMed. https://pubmed.ncbi.nlm.nih.gov/40620441/
Disclosure: This article is for general information only. It is not medical advice. Peptide Skincare has no affiliate links in this article and received no payment from any manufacturer mentioned. TCA peels are medical procedures. Have one done by a dermatologist or trained clinician, and ask about risks for your skin type before booking.