Azelaic Acid for Acne and the Marks It Leaves Behind

By Dr. Romario D. Thomas, board-certified dermatologist | Last reviewed: Dec 2024

Most skincare ingredients do one job well. Azelaic acid does two — and that distinction matters when your skin is dealing with active breakouts and the dark spots they leave behind at the same time.

Quick answer: Azelaic acid fights acne-causing bacteria, calms the inflammation that triggers breakouts, and inhibits the enzyme responsible for producing excess pigment in post-breakout marks. It works at both ends of the problem — the blemish and what comes after — and is generally well-tolerated across skin tones, including melanin-rich skin.

Why Breakouts Leave Dark Marks

A blemish does not always resolve cleanly. For many people — particularly those with medium to deep skin tones — what the breakout leaves behind can feel just as visible as the breakout itself. That flat, brown or grayish mark sitting on otherwise clear skin can persist for weeks or months after the acne has healed.

Here is why it happens. Every inflammatory blemish triggers a local immune response in the skin. Melanocytes — the cells responsible for producing pigment — are sensitive to that inflammation signal. They respond by producing more melanin than the area needs. When the blemish resolves, that excess pigment remains as a dark mark on the surface. Dermatologists call this post-inflammatory hyperpigmentation, or PIH. [¹]

In melanin-rich skin, this response is often more pronounced. Melanocytes in deeper skin tones are more reactive to inflammatory signals, which means that even a moderate breakout can generate a mark that lingers. [¹] In tropical and high-UV climates, ongoing sun exposure adds another layer of complexity — UV stimulates melanin production and can deepen existing marks before they have had a chance to fade.

This creates a two-part problem: active breakouts keep generating new marks, while existing marks from previous cycles have not yet faded. Addressing one without the other rarely feels like meaningful progress. Azelaic acid is one of the few ingredients positioned to work on both.

What Azelaic Acid Actually Does

Azelaic acid is a naturally occurring dicarboxylic acid found in grains such as wheat, barley, and rye. It has a long track record in dermatology, with evidence supporting its use in acne and skin-tone concerns.

For active breakouts, azelaic acid works through three main pathways:

It has antibacterial activity against Cutibacterium acnes (the bacterium closely involved in acne lesions), which helps reduce the bacterial load that contributes to inflamed blemishes. It normalizes the process of skin cell shedding inside the follicle, which can reduce the buildup that leads to clogged pores. And it has meaningful anti-inflammatory properties — calming the redness and swelling associated with papules and pustules — which addresses the very trigger responsible for PIH in the first place. [²]

For post-breakout discoloration, azelaic acid inhibits tyrosinase — an enzyme that plays a central role in melanin production. By reducing tyrosinase activity selectively in overactive melanocytes (those responding to inflammation with excess melanin), it can help reduce the intensity of existing marks and support a more even skin tone over time. [²] [³]

An important nuance for readers with deeper skin tones: at the concentrations used in cosmetic formulations, azelaic acid’s selective action targets melanocytes that are overproducing pigment in response to inflammation — not healthy, normally functioning skin pigmentation. This is a meaningful distinction from more aggressive depigmenting agents, and part of why azelaic acid has a favorable profile for melanin-rich skin. [³]

Which Product Fits Your Concern: Dr. Thomas’s Framework

The question is not simply whether azelaic acid works — it is which formulation suits what your skin is dealing with right now.

If active breakouts are your primary concern, alongside existing marks:

The Absolut Skin Acne Defence Cream ($23.99) combines azelaic acid with Quaternium-73 (an antimicrobial ingredient) and Centella asiatica extract, supporting a calmer skin environment while helping to manage active breakouts and associated discoloration. Apply a thin layer morning and evening after cleansing, before SPF in the morning.

Precaution: Do not apply to open wounds. If a lesion has broken skin or is actively weeping, allow that site to heal before applying product to that area. Patch test before full-face application.

If your breakouts are mild or well-managed and your main focus is fading marks:

The Absolut Skin Radiance Serum ($19.99) pairs azelaic acid with niacinamide and mandelic acid — a combination that works across the melanin production pathway (azelaic acid), the transfer of pigment to surface skin cells (niacinamide), and surface-level cell turnover (mandelic acid). Apply 2–3 drops morning and evening after cleansing.

If you are managing both active breakouts and established marks:

Both products can be used together. Apply the Radiance Serum first as the lighter, serum-consistency product, allow it to absorb briefly, then apply the Acne Defence Cream. This layering sequence lets each formula work without one occluding the other.

If you are unsure which concern is primary, consider this honestly: are you constantly dealing with new breakouts, or has your skin largely settled and you are mainly focused on the marks already there? Your answer points to the right starting product.

Are you treating active breakouts, leftover marks — or both? Share where your skin is right now in the comments — your answer shapes which part of this routine matters most.

Morning and evening routine when using both Radiance Serum and Acne Defence Cream.

The Ingredient Team

Azelaic acid is the anchor in both products, but it works alongside other ingredients that address the acne-to-pigment cycle from different angles.

Niacinamide (Radiance Serum)

Research shows that niacinamide inhibits the transfer of melanin-containing structures — melanosomes — from melanocyte cells to the surface keratinocyte cells where pigment becomes visible. [⁴] Niacinamide also supports the skin barrier and has anti-inflammatory properties, which can help reduce the sensitivity and redness that often accompany breakout-prone and post-breakout skin.

Mandelic acid (Radiance Serum)

Mandelic acid is an alpha hydroxy acid (AHA) derived from bitter almonds. It supports cell turnover, encouraging the surface skin cells carrying pigment to shed more efficiently and making way for fresher, more evenly toned cells underneath. [⁵] Because of its relatively large molecular structure compared to glycolic acid, mandelic acid penetrates more gradually — a consideration that makes it a useful option for sensitive skin and for melanin-rich tones where gentler exfoliation is often preferred.

Centella asiatica (Acne Defence Cream)

Centella asiatica is widely used in formulations designed to support sensitized and reactive skin. It has skin-calming properties that can help the skin manage the repeated cycles of breakouts and inflammation.

Quaternium-73 (Acne Defence Cream)

Quaternium-73 is an antimicrobial ingredient that works alongside azelaic acid to create an environment less hospitable to acne-causing bacteria, adding another mechanism to the active-breakout formula.

The active ingredients in each formula and the role they play in addressing the acne-and-marks cycle.

What to Realistically Expect

Azelaic acid is not an overnight solution, and claiming otherwise would be misleading.

What you can realistically expect with consistent use is a gradual reduction in the frequency and intensity of new breakouts, followed by a slower accumulation of new marks. As active breakouts become less frequent, existing marks are given the opportunity to fade. That combination — fewer new marks forming, existing marks fading with time — is what most people working with azelaic acid notice with a consistent approach.

Sun protection is not optional during this process. UV exposure is a significant driver of PIH and can deepen marks that are in the process of fading. Using an SPF 50 every morning — applied 15 minutes before going outdoors, and reapplied every 2–4 hours based on your activity level and time outdoors — supports everything you are doing at the ingredient level. This matters in all climates but is especially relevant in tropical and high-UV environments where incidental UV exposure is continuous. Apply the SPF 50 Moisturizing Sunscreen every morning as the final skincare step before makeup.

One common mistake is assuming that higher concentration or more frequent application will accelerate results. With azelaic acid, consistency matters more than intensity. Use it as directed, protect your skin from UV, and give the routine adequate, uninterrupted time.

Signs of Irritation and When to Pause

A mild tingling or slight warmth immediately after applying azelaic acid is common, especially in the first few uses. This is a recognized initial response and typically settles as your skin adjusts. It is not the same as an adverse reaction.

Pause use and consult a qualified clinician if you experience:

•          Burning that persists beyond the first few minutes of application

•          Significant redness, swelling, or peeling beyond normal surface flaking

•          Itching or hives, which can indicate sensitivity to the formulation

How to introduce it more gradually:

If you have reactive or sensitized skin, patch testing is strongly advised before full-face application: apply a small amount to the inside of your forearm on two to three consecutive evenings. If no reaction occurs, proceed to a small area of the face. Starting with once-daily evening application before moving to twice daily can also reduce initial skin response.

If irritation does not improve after reducing frequency, stop the product and speak with a dermatologist before continuing.

Frequently Asked Questions

Can I use azelaic acid every day?

Yes, most people can use azelaic acid morning and evening once their skin has adjusted to it. If you are new to the ingredient, starting with once daily in the evening and building to twice daily over one to two weeks is a reasonable approach that gives your skin time to settle.

Is azelaic acid safe for darker skin tones?

Azelaic acid has a favorable profile for melanin-rich skin precisely because of its selective action. Unlike certain other ingredients used for pigmentation concerns, it acts selectively on overactive melanocytes — those responding to inflammation with excess melanin — rather than on normally functioning skin pigmentation at typical formulation concentrations. This distinction matters for anyone concerned about unintended lightening of surrounding skin. [³]

Should I use the Radiance Serum or the Acne Defence Cream?

If active breakouts are your primary concern alongside marks, start with the Acne Defence Cream. If your skin is relatively clear and you are focused on fading post-breakout discoloration, start with the Radiance Serum. If both concerns are active, both products can be layered — serum first, then cream.

Can I use azelaic acid with niacinamide?

Yes. Niacinamide and azelaic acid work through different mechanisms and are compatible. The Radiance Serum contains both ingredients in a single formulation, so if you are using that product, they are already working together. You do not need to separate them or use them at different times of day.

Do I still need sunscreen when using azelaic acid?

Absolutely — and this point is worth emphasizing. UV exposure can significantly worsen PIH and slow the fading of post-breakout marks, which means that skipping SPF directly undermines what your active ingredients are working to do. Apply the SPF 50 Moisturizing Sunscreen every morning as the final skincare step before makeup.

About the author: Dr. Romario D. Thomas is a board-certified dermatologist and the founder of Absolut Skin. Learn more about Dr. Thomas →

Choose the concern-matched routine: Shop Radiance Serum → | Shop Acne Defence Cream →

Not sure which routine fits your skin? Take the Absolut Skin Skin Analysis →

References

[¹] Davis EC, Callender VD. Postinflammatory hyperpigmentation: a review of the epidemiology, clinical features, and treatment options in skin of color. J Clin Aesthet Dermatol. 2010;3(7):20–31. PMC2921758

[²] Wollina U, Gaber B. Azelaic acid in dermatology. Dermatol Ther (Heidelb). 2024. PMC11116308

[³] Azelaic acid use in skin of color. PMID 23652891. 

[⁴] Hakozaki T, Minwalla L, Zhuang J, et al. The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer. Br J Dermatol. 2002;147(1):20–31. PMID 12100180

[⁵] Alpha hydroxy acids and cell turnover. PMC11268769.