Azelaic acid for dark spots: what it does

Azelaic acid is an acid found in whole grain cereals and animal foods, and the body can also make it, according to its FDA drug label. In skin care it has a special place: it treats acne, and it fades the dark marks that acne leaves. This guide covers how it works on pigment, what the trials found, how to use it, and one warning for darker skin. It is part of Skinli's guide to hyperpigmentation.

Why azelaic acid suits acne marks

The American Academy of Dermatology (AAD) includes azelaic acid among the five ingredients that can fade dark spots without a prescription. Its acne treatment page explains why it fits acne so well. Azelaic acid:

• Opens clogged pores and helps keep them open
• Works on the bacteria linked to acne
• Reduces the inflammation of acne
• Treats the dark spots that appear when acne clears

The first three stop new marks from forming. The last one fades marks that already exist. For someone with acne and dark marks at the same time, one product does both jobs.

The 2024 acne guideline from the Journal of the American Academy of Dermatology gives azelaic acid a conditional recommendation for acne. Benzoyl peroxide and topical retinoids get strong recommendations in the same guideline.

How it works on pigment

Skin cells need an enzyme called tyrosinase to make melanin, the pigment behind dark spots. A 2010 review in the Journal of Clinical and Aesthetic Dermatology says azelaic acid blocks tyrosinase. The review adds that its other effects are selective, aimed at abnormal, overactive pigment cells.

What the trials found

Study	Who	What was used	Result
2024, Dermatology and Therapy	72 people with mild to moderate acne, randomized	15% gel or a plain gel, twice daily for 12 weeks	Red acne marks improved more than with the plain gel at weeks 8 and 12. Melanin in brown marks fell by week 12. Few side effects
2011, Journal of Drugs in Dermatology	Pilot study in people with acne and dark marks	15% gel, twice daily, 16 weeks	Reduced both acne and dark marks
1998 trial, summarized in a 2010 review	52 people with skin types IV to VI, dark patches including acne marks and melasma	20% cream or a plain cream	Greater fading than the plain cream after 24 weeks. Side effects were mild and short-lived

Two limits are worth knowing. The trials are small, and the 2011 study had no comparison group. The 2010 review says larger studies of azelaic acid for marks after inflammation are still needed. In the 2024 trial, brown marks also faded in the plain gel group, which fits the AAD's point that many marks fade over time on their own once acne is treated.

Red marks as well as brown

Many people with lighter skin get red or pink marks after acne instead of brown ones. The 2024 trial measured both. Azelaic acid reduced the redness in red marks more than the plain gel did. That makes it one of the few ingredients with trial data on both types of acne mark.

Strengths and forms

The 2010 review describes two prescription forms: a 15% gel, typically used for rosacea, and a 20% cream, commonly used for acne, melasma and dark marks. The 20% cream sold as Azelex is FDA-approved for mild to moderate acne and needs a prescription in the US. Lower strengths are sold without a prescription.

Skinli's 12-week plan uses an azelaic acid 10% cream for people whose photo shows flat red or brown marks. It starts in week 5, once the acne gels are part of the night routine, and goes on in the morning before sunscreen.

How to use it

The FDA-approved label for the 20% cream gives these directions:

1. Wash the skin and pat it dry.
2. Massage a thin film gently into the affected areas.
3. Use it twice daily, morning and evening.
4. Wash your hands afterward.

Follow the directions on your own product, because strengths and forms differ. Apply it over the whole area where acne and marks appear. Trials applied it to the skin with acne, and covering the area also treats clogged pores nearby before they become new pimples.

Add it as the only new product that week, and patch test it first. If you also use an acne gel at night, azelaic acid in the morning keeps the two apart, as Skinli's plan does.

Side effects

The Azelex label says temporary itching, burning or stinging may occur, usually at the start of treatment and on broken or inflamed skin. It says this irritation commonly fades with continued use. In the US trials for the 20% cream, these reactions affected 1% to 5% of patients.

The warning for darker skin

The label adds one warning that matters for this topic. There have been isolated reports of hypopigmentation, meaning patches lighter than the skin around them, after using azelaic acid. Because azelaic acid has not been well studied in people with dark complexions, the label says they should be watched for early signs of lighter patches. If you have darker skin, compare monthly photos and stop and see a doctor if pale patches appear. The dark spots on darker skin page covers other cautions.

Azelaic acid for melasma

The AAD names azelaic acid as one of the gentler prescription options a dermatologist may use for melasma, along with kojic acid and vitamin C. The 2010 review says several studies have shown it to be safe and effective for melasma in skin of color. Melasma needs a full plan with daily sun protection, so read the melasma page before treating it on your own.

Sunscreen comes first

Sun keeps making new color while a cream fades the old. The AAD says effective treatment for dark spots begins with sunscreen, and recommends a tinted sunscreen with iron oxide, SPF 30 or higher, every day. Azelaic acid does its part only when sun is not making new color at the same time.

Where it fits in a routine

Azelaic acid works well next to the other steps of an acne routine, as long as each new product joins one at a time. This is how Skinli's 12-week plan places it:

Time	Step
Morning	Gentle cleanser, light moisturizer, azelaic acid 10% cream (from week 5), sunscreen SPF 30 or more
Night	Gentle cleanser, the acne gels (adapalene 0.1% and benzoyl peroxide 2.5%), light moisturizer

Putting azelaic acid in the morning and the acne gels at night spreads the active products across the day. That lowers the chance of irritation, which matters because irritated skin can form new marks. The complete acne skincare routine explains each step.

How long to try it

Give azelaic acid time before judging it. For acne itself, the Azelex label says most people with inflamed pimples see improvement within four weeks. Marks take longer. In the 2024 trial, changes were measured at 8 and 12 weeks, and the older 20% cream trial ran for 24 weeks. The AAD says a mark a few shades darker than your skin usually fades within 6 to 12 months once the acne stops.

Take a photo once a month in the same light and compare. Fewer new marks is often the first sign, because the acne settles before the old marks fade. The guide on how long dark marks take to fade gives timelines for each type of mark.

When to see a doctor

See a dermatologist if marks have not faded after several months of steady care with sunscreen, if acne keeps leaving new marks, or if you notice light patches. The AAD says some dark spots need a prescription-strength treatment. NICE, which writes clinical guidelines for England, advises doctors to consider a dermatologist referral for acne with pigment changes that persist. Any spot that is changing in size, shape or color needs a doctor for a different reason, explained in when a dark spot needs a doctor.

Azelaic acid compared with other options

Ingredient	Treats acne too?	Main caution
Azelaic acid	Yes	Rare light patches, stinging at first
Adapalene or another retinoid	Yes	Irritation, which can cause new marks on darker skin
Vitamin C	No	Breaks down in light and air
Niacinamide	Not on the AAD list	Not studied for acne marks on darker skin

For the other options, read retinol and tretinoin for dark spots and vitamin C for dark spots. For the full order of steps, see dark marks after pimples.