Does Azelaic Acid Fade Dark Spots on Skin of Colour?
The breakout has cleared, but the brown mark it left behind is still there. For many people with skin of colour, that mark lasts much longer than the spot itself.
Yes. Azelaic acid can help improve certain dark marks, particularly post-inflammatory hyperpigmentation, or PIH, left after acne. It is especially useful when active breakouts, inflammation and post-acne marks occur together.
However, it is not an overnight treatment. Results usually take weeks to months, and the strongest evidence mainly involves 15% to 20% azelaic acid. Lower-strength formulas and azelaic-acid derivatives may still be useful, but they should not be expected to perform exactly like prescription-strength treatments.
The formula must also be well tolerated. In melanin-rich skin, persistent irritation can trigger further pigmentation rather than help existing marks fade.
What type of mark are you treating?
Before choosing an ingredient, identify what is actually left behind.
- Brown, tan or grey-brown flat marks: These are usually PIH caused by excess melanin after inflammation.
- Pink, red or purple flat marks: These may be post-inflammatory erythema, or PIE, which is linked more closely to lingering vascular changes.
- Indented or raised scars: These are texture changes. Azelaic acid may help surrounding discolouration, but it cannot rebuild lost tissue.
- Melasma: This usually appears as larger, often symmetrical patches. Azelaic acid has been studied for melasma, but it may require professional assessment.
Read more: How to Fade Post-Acne Marks on Skin of Colour: PIH vs PIE
Why is azelaic acid useful for acne and dark marks?
For skin of colour, one breakout can create three linked concerns:
Active acne → inflammation or redness → a lingering brown mark
Azelaic acid is multifunctional. Research supports anti-inflammatory, antimicrobial, comedolytic and pigment-regulating actions, so it may help active acne while supporting improvement in the marks it leaves behind.
A 2023 systematic review of 43 randomised controlled trials found that azelaic acid was more effective than an inactive vehicle for acne, rosacea and melasma. (PubMed)
Dr Vanita Rattan favours azelaic acid for skin of colour because it is multifunctional and can target several concerns while remaining gentle on the skin barrier.
How does azelaic acid help hyperpigmentation?
Azelaic acid helps calm inflammation, can reduce activity in the pigment-production pathway and supports the normal shedding of skin cells.
Think of acne as the alarm and PIH as the dark mark left behind after the inflammation settles. Azelaic acid may help calm the inflammation while also reducing excess pigment production.
It will not remove every mark. Older, deeper or repeatedly inflamed pigmentation may need a combination approach, daily sunscreen or professional treatment.
Is 10% azelaic acid strong enough for dark spots?
The answer depends on the concern, the formulation and how consistently you can use it.
| Form | What to know |
|---|---|
| 10% azelaic acid | Common in cosmetic products. It may support mild acne and uneven tone, but should not be equated with the higher strengths studied clinically. |
| 15% azelaic acid | Used in prescription or dermatological formulas in some countries. |
| 20% azelaic acid | Used in many clinical studies of acne and melasma. |
| Azelaic-acid derivative | May work well in a multi-active formula, but is not identical to pure 15% or 20% azelaic acid. |
In a 24-week randomised study involving 329 women with melasma, 20% azelaic acid produced good or excellent results in 65% of participants. Both treatment groups also used broad-spectrum sunscreen. This demonstrates the importance of concentration, time and light protection, but it is not a guarantee for every cosmetic formula. (PubMed)
Higher is not automatically better. A product you can use consistently may be more useful than a stronger formula that causes inflammation.
How long does azelaic acid take to fade dark marks?
Think in months, not days.
You may notice changes in active breakouts before an older brown mark begins to fade. Clinical studies commonly assess azelaic acid after 6 to 12 weeks, while pigmentation studies may continue for several months. (PubMed)
Take photographs in the same lighting before starting and review your progress after approximately 8 to 12 weeks.
Seek professional advice if the marks are worsening, the skin remains irritated or there is no improvement after consistent use.
Can azelaic acid make pigmentation worse?
Azelaic acid is generally well tolerated, but stinging, burning, itching or dryness can occur.
A mild, temporary tingle is different from persistent burning, swelling or cracking. Official prescribing information for topical azelaic acid also warns about hypersensitivity and local skin reactions. (DailyMed)
Continuing through significant irritation may be counterproductive for pigmentation-prone skin because inflammation can trigger PIH.
Reduce the frequency or stop using the product if discomfort persists.
Does azelaic acid cause purging?
Do not assume that every new breakout is "purging" or proof that the product is working.
A flare may be caused by:
- Irritation.
- Another ingredient in the formula.
- The natural acne cycle.
- Introducing too many active ingredients at once.
When breakouts appear in unusual areas or are accompanied by burning and barrier damage, reassess the routine rather than simply waiting for the reaction to pass.
Introduce one new product at a time and take weekly photographs. This will make it easier to see whether your skin is improving or becoming irritated.
What can you use with azelaic acid?
Azelaic acid is often combined with ingredients such as:
- Niacinamide.
- Green-tea extract.
- Alpha-arbutin.
- Salicylic acid.
- Stable vitamin C derivatives.
Dr Vanita advises caution when combining azelaic acid with high-strength L-ascorbic acid, strong glycolic acid or a separate retinol product if the overall routine creates unnecessary irritation.
A finished multi-active formula is different from layering several strong serums yourself. In a finished product, the ingredients, percentages and pH should have been designed to work together.
How should you introduce azelaic acid?
Patch-test the product before applying it across your face.
If your skin is sensitive, start two or three times a week on clean, dry skin. Increase the frequency only if your skin remains comfortable.
Use a suitable fragrance-free moisturiser when needed and apply broad-spectrum SPF 50 every morning. Avoid applying azelaic acid to broken or severely irritated skin.
Stop using the product and seek medical advice if you experience persistent burning, swelling or a worsening rash.
Can azelaic acid be used during pregnancy?
Topical azelaic acid is only minimally absorbed into the bloodstream, so it is not expected to expose the developing baby to a meaningful amount. However, check the complete product and your wider skincare routine with your doctor or midwife during pregnancy. (DailyMed)
A Complete Routine for Acne and Post-Acne Marks
For oily, acne-prone skin with active spots, red marks and brown marks, the TRIO Blemish Complete Range provides a structured four-product system.
TRIO Blemish Face Wash
This contains salicylic acid, niacinamide, glycerin and panthenol to cleanse oily skin and help unclog pores.
TRIO Blemish Exfoliator
This contains 2% salicylic acid and is used according to the skin's tolerance rather than automatically every day.
TRIO Blemish AM Gel Moisturiser
This contains potassium azeloyl diglycinate (an azelaic-acid derivative) alongside 2% niacinamide, 2% sodium ascorbyl phosphate, glycerin, green-tea extract and allantoin.
TRIO Blemish PM Gel Moisturiser
This contains a night-time combination that includes retinol, retinaldehyde, niacinamide, vitamin C derivatives, alpha-arbutin, salicylic acid and ceramides.
| When | Routine |
|---|---|
| Morning | TRIO Blemish Face Wash → TRIO Blemish AM Gel Moisturiser → broad-spectrum SPF 50 |
| Evening | TRIO Blemish Face Wash → TRIO Blemish Exfoliator → TRIO Blemish PM Gel Moisturiser |
The range is formulated without denatured alcohol, fragrance or essential oils.
In an independent consumer study involving 38 participants, more than 70% reported improved pores, blackheads and oil control after four weeks. Sixty-five per cent reported reduced red and brown marks after eight weeks.
Frequently asked questions
Can azelaic acid fade old dark spots?
It may help, but older or deeper marks generally take longer and may need a combination treatment.
Can I use azelaic acid every day?
Many people can, but sensitive skin may need a gradual introduction. Follow the instructions for your specific product.
Can I use azelaic acid with niacinamide?
Yes. These ingredients are commonly combined to support oil control, inflammation, the skin barrier and uneven tone.
Can I use azelaic acid with vitamin C or retinol?
It depends on the form, strength and your skin's tolerance. Avoid layering several strong products if the combination irritates your skin.
Does azelaic acid treat acne scars?
It may help flat red or brown post-acne marks, but it cannot correct an indented or raised scar.
Should I use azelaic acid in the morning or evening?
Either can work, depending on the formula. Follow the product instructions and use SPF 50 every morning.
Final takeaway
Azelaic acid can help manage active acne, calm inflammation and improve the appearance of brown post-acne marks. However, results are gradual, and it cannot correct indented or raised acne scars.
Choose an appropriate formula, introduce it gradually, avoid an irritating routine and protect your skin every morning with SPF 50.
Dr Vanita Rattan is a doctor, cosmetic formulator and author of Skin Revolution with HarperCollins. She specialises in skincare for melanin-rich skin and founded her brand to create evidence-led products for Black and brown skin tones. Her work focuses on common concerns in skin of colour, including hyperpigmentation, post-inflammatory pigmentation, melasma, uneven tone, and barrier health.
Back to Dr. V's Skin of Colour Blog
