Does glycolic acid help with dark spots?

Reference: Dayal et al., 2016

Glycolic acid toners promise glow. ✨ But does glycolic acid help with dark spots, the brown marks people want gone? The honest answer has a twist.

Does glycolic acid help with dark spots?

Maybe a little, but the proof for dark spots is thin. 🤏 In the main cream study, 74 women aged 40 to 70 with sun-damaged skin used an 8% glycolic acid cream, an 8% lactic acid cream or a plain cream for 22 weeks.

On faces, 76% improved at least one step in overall sun damage with glycolic acid and 71% with lactic acid, against 40% with the plain cream.

Reference: Stiller et al., 1996

For brown, blotchy spots, the study reported a clear win only for lactic acid, and only on the forearms. It reported no such result for glycolic acid. 🤔

Reference: Stiller et al., 1996

So glycolic acid helps the overall look of sun-damaged skin more than it helps dark spots by name. That's why PERBETE's glycolic acid page links it to texture and sun damage, not to dark spots.

What about glycolic acid peels for dark spots?

Peels are stronger and done in a clinic. 🏥 In one study, 90 people with dark under-eye circles, a different kind of dark color than spots, got a 20% glycolic acid peel or a 15% lactic acid peel every 3 weeks, or used a 20% vitamin C product daily, for 12 weeks.

The dark circles improved by more than half in 73% of the glycolic peel group, 57% of the lactic peel group and 27% of the vitamin C group.

Reference: Dayal et al., 2016

The glycolic peel also caused the most side effects, and no group went untreated. 📝

In 19 people with darker skin and marks left by inflammation, everyone used a daily gel with hydroquinone and glycolic acid plus a prescription retinoid. Some were picked at random to also get six glycolic acid peels. Both groups improved, and the peels added a bit more.

Reference: Burns et al., 1997

Can glycolic acid make dark spots worse?

It can make skin burn more easily in the sun. ☀️ In the study behind the FDA's warning, 4 weeks of a 10% glycolic acid product made skin redden from UV 18% more easily and doubled UV damage to skin cells. The effect was gone a week after stopping.

The FDA asks alpha hydroxy acid products to warn about it: use sunscreen while using them and for a week after.

Reference: Kaidbey et al., 2003 Reference: US Food and Drug Administration, 2022

Irritation is the other risk. A review of marks left by inflammation warns that irritation from pigment treatments can make the marks worse. 😬

Reference: Davis and Callender, 2010

An acid that makes you burn faster, on a dark spot the sun made darker? Sunscreen is not optional here.

How strong is glycolic acid in skincare?

An expert panel that reviews cosmetic ingredients found glycolic and lactic acid safe in everyday products at 10% or less, at a pH of 3.5 or higher, with sun protection advice. 🧪 Salon peels can go up to 30%, rinsed off and done by trained people.

Reference: CIR Expert Panel, 1998

On October 29, 2026, PERBETE's catalogue had 669 products listing glycolic acid. 210 of them had it in the first five spots of the ingredient list, so it is often a main ingredient.

The list order hints at the amount. It doesn't print the percent or the pH. 🏷️

Which ingredients have more study for dark spots?

On October 30, 2026, PERBETE's dark spots page linked 29 ingredients to dark spots. 📊 The strongest evidence sat behind azelaic acid, isobutylamido thiazolyl resorcinol and tranexamic acid.

Niacinamide is on that list too. If your dark spots came from pimples, the acne scars and marks page has its own ranking.

Is glycolic acid okay during pregnancy?

PERBETE's glycolic acid page says "not advised against on skin" for pregnancy. 🤰 One review found glycolic acid on skin was not a concern, because very little gets into the body. Another found glycolic acid peels were considered safe.

Reference: Bozzo et al., 2011 Reference: Trivedi et al., 2017

Ask your doctor first anyway, especially before a peel.

How well does glycolic acid fit YOUR skin?

Glycolic acid suits some skin and bothers other skin. 💭 Your skin type, how much sun you get, your other actives and a pregnancy all change the answer.

The free skin quiz takes 5 questions and builds a routine of 3, 5 or 7 steps around your answers, with every ingredient checked. ✨

How well does glycolic acid fit YOUR skin? Take the free 5-question skin quiz