Chemical Peels for Acne: Glycolic, Salicylic and TCA Compared

Chemical peels can help both active acne and the marks and scars it leaves, but by different routes. For breakouts, superficial peels such as glycolic and salicylic acid appear to work about equally well in small trials. For indented scars, stronger trichloroacetic acid (TCA) peels, including the spot technique TCA CROSS, are used. For dark marks, peels are an add-on to sunscreen and topicals. The big caveat is pigment: in darker skin, a peel that is too strong can leave marks worse than the ones you started with.

What is a chemical peel, and how deep do they go?

A chemical peel is an acid solution applied to the skin to remove damaged outer layers in a controlled way, so fresher skin grows back. Depth matters more than brand or name. StatPearls groups peels like this, and the American Academy of Dermatology (AAD) gives the typical recovery for each depth:

For acne, the peels most studied are superficial ones. A 2018 review lists salicylic acid (5–30%), glycolic acid (20–70%), lactic and mandelic acid, TCA (15–50%) and Jessner’s solution as the agents most commonly used.

Do chemical peels help active acne?

Modestly, and the evidence is thin. A systematic review of randomised trials in BMJ Open found 12 trials with 387 participants. Its main findings:

• Commonly used peels (glycolic, salicylic, Jessner’s, amino fruit acid and others) appeared similarly effective for mild to moderate acne and were well tolerated.
• Glycolic acid peeling beat placebo (risk ratio 2.30).
• A combined salicylic and mandelic acid peel outperformed glycolic acid (85.3% vs 68.5% on the trial’s improvement measure).
• Salicylic acid peels may beat Jessner’s solution for blackheads and whiteheads but were less effective than light therapy for pustules.

The catch: the reviewers rated the trials’ methodological quality as very low to moderate. That’s why the AAD’s 2024 acne guideline said available evidence was insufficient to make recommendations for procedures such as chemical peels. In other words, peels are a reasonable add-on to proven daily treatments (a retinoid, benzoyl peroxide, and so on), not a replacement for them. The 2018 review describes studies using salicylic or glycolic peels every 2 to 3 weeks over roughly 10 to 12 weeks.

If you’re weighing the two main acids for daily use rather than in-office peels, see salicylic acid for acne.

Do chemical peels help acne scars?

They can soften shallow depressed scars, and TCA CROSS targets deep, narrow ones. The AAD says peels stimulate collagen and elastin, and that mild or medium peels for scars usually mean 3 to 5 treatments given every 2 to 4 weeks, after 2 to 4 weeks of preparing your skin at home.

In the Cochrane review of acne scar treatments, chemical peeling produced similar participant-rated improvement to fractional laser and to skin needling. But peeling was not tolerable for 16% of participants in the trials reporting it, and hyperpigmentation occurred, particularly with peels. Overall certainty was very low to moderate.

TCA CROSS is a different technique: rather than peeling the whole face, a clinician presses a tiny amount of 70 to 100% TCA into the bottom of individual ice pick or boxcar scars. DermNet says most people need 3 to 6 sessions spaced 2 to 8 weeks apart and can expect a 1 to 2-grade improvement over about 6 months. For how peels fit with lasers, microneedling and subcision, see acne scar treatments.

Can peels fade dark marks after acne?

Yes, as a second-line tool. StatPearls lists glycolic, salicylic and TCA peels among treatments for post-inflammatory hyperpigmentation (PIH), working by removing pigment-containing skin cells, but warns that peels “can cause skin irritation and additional hyperpigmentation.” Daily sunscreen and topicals come first. The 2018 review notes that dermatologists often use lightening agents such as hydroquinone or azelaic acid before and after a peel to reduce this risk. More in post-inflammatory hyperpigmentation.

Are chemical peels safe for darker skin?

Superficial peels generally are, when done carefully; deep peels are a different story.

• The AAD warns that people with skin of colour can develop permanent pigment problems and should see a dermatologist experienced in peeling darker skin.
• The 2018 review says people with skin types IV to VI are at higher risk of post-peel hyperpigmentation and that deep peels should be avoided, while superficial peels remain an option.
• StatPearls notes skin types III to VI carry a risk of abnormal pigmentation, and describes “priming” the skin for 2 to 4 weeks beforehand with agents such as tretinoin or 2–4% hydroquinone when pigment risk is a concern.

What are the side effects, and who should avoid peels?

With superficial acne peels, the trials in the BMJ Open review mostly reported temporary burning or stinging, redness, scaling, swelling and dryness. Deeper peels carry more serious risks. StatPearls lists infection (bacterial, viral or fungal), PIH, lightening of the skin and, rarely, scarring. The AAD adds that scratching treated skin or picking off scabs raises the risk of infection and scarring.

Points to raise before booking:

• Isotretinoin: StatPearls advises avoiding medium and deep peels within 6 months of isotretinoin, although the 2018 review cites newer evidence that found insufficient reason to delay. This is a judgement call for your clinician; see isotretinoin.
• Pregnancy and breastfeeding: StatPearls lists these as contraindications for medium and deep peels. The AAD says salicylic acid is generally considered safe for limited use in pregnancy but advises checking with your obstetrician or dermatologist first. See pregnancy-safe acne treatment.
• Active infection or open wounds in the area rule out any peel.

How do you prepare for a peel, and what happens after?

Preparation is part of the treatment. The AAD says that before a scar peel you may be asked to prime your skin at home for 2 to 4 weeks, which can include applying a retinoid or taking antiviral medication if you get cold sores, and to be strict about sun protection. Afterwards, the AAD lists persistent redness and temporary darkening as possible effects, and lighter skin as a possibility after medium or deep peels. Don’t pick at peeling skin: let it shed on its own, keep up gentle moisturising, and follow your clinician’s plan for when to restart acne treatments.

At-home peels vs professional peels: what’s the difference?

Strength, mostly. The US Food and Drug Administration (FDA) reports that the cosmetic industry’s safety panel considers alpha hydroxy acid (AHA) products safe for consumers at 10% or less with a pH of 3.5 or higher. Compare that with the 20–70% glycolic acid used in clinic acne peels described in the 2018 review. Home “peels” are really strong exfoliants, and that’s a reasonable place to start for mild acne or dullness.

Even gentle AHAs raise sun sensitivity. The FDA describes a study in which four weeks of AHA use increased sensitivity to UV reddening by 18% and doubled UV-induced cell damage on average, an effect that disappeared a week after stopping. So daily broad-spectrum sunscreen is non-negotiable (see moisturizer and sunscreen for acne). I’d steer clear of buying high-strength professional peel solutions online: the pigment and burn risks in the sections above are exactly why they are done by trained clinicians.

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