Kojic acid for acne marks featuring QTWAYS Niacinamide, Kojic Acid & Vitamin B5 Face Serum with benefits, how it works, and safe usage for fading dark spots.

Kojic Acid for Acne Marks: Benefits, How It Works & How to Use It Safely

June 29, 2026

Brown acne marks can linger for weeks or even months after a breakout has healed, making your skin look uneven long after the pimple has disappeared. These marks, known as Post-Inflammatory Hyperpigmentation (PIH), develop when inflammation triggers excess melanin production during the skin's healing process.

One ingredient that is frequently recommended by dermatologists for post-acne pigmentation is Kojic Acid.

Derived from certain species of fungi during the fermentation of rice and other natural sources, Kojic Acid has been used in dermatology for many years because of its ability to reduce excess melanin production. Rather than bleaching the skin, it helps regulate the pigmentation process, allowing dark acne marks to gradually fade over time.

However, Kojic Acid is not a miracle ingredient.

It works well for flat brown acne marks, but it cannot repair indented or raised acne scars, which involve structural collagen damage beneath the skin.

In this guide, you'll learn:

What Kojic Acid is.
How Kojic Acid works on acne marks.
Whether it removes acne scars.
How long it takes to show results.
How to use it safely.
Which ingredients work well with Kojic Acid.
How to choose the best Kojic Acid serum for acne marks.

Does Kojic Acid Remove Acne Marks?

Yes—Kojic Acid can help improve brown acne marks caused by Post-Inflammatory Hyperpigmentation (PIH).

It works by reducing the production of excess melanin, the pigment responsible for dark spots that remain after acne heals.

However, it's important to understand what Kojic Acid can and cannot do.

Skin Concern	Does Kojic Acid Help?
Brown Acne Marks (PIH)	Yes
Dark Spots	Yes
Uneven Skin Tone	Yes
Red Acne Marks (PIE)	Limited
Ice Pick Scars	No
Rolling Scars	No
Boxcar Scars	No
Raised Acne Scars	No

This distinction is important because many people mistakenly expect pigmentation treatments to repair textural scars.

If your skin feels smooth but looks darker than the surrounding area, Kojic Acid may help. If your skin has visible pits or raised scars, professional treatments such as microneedling or laser resurfacing are usually required.

For a detailed comparison, read our guide on Acne Marks vs Acne Scars.

What Is Kojic Acid?

Kojic Acid is a naturally derived ingredient widely used in skincare to improve hyperpigmentation and uneven skin tone.

It is produced during the fermentation of certain fungi and has become one of the most studied ingredients for reducing excess melanin production.

Unlike exfoliating acids such as Glycolic Acid or Salicylic Acid, Kojic Acid does not primarily remove dead skin cells.

Instead, it works by targeting the biological pathway responsible for pigment production.

This makes it particularly useful for concerns such as:

Post-acne pigmentation.
Sun spots.
Age spots.
Uneven skin tone.
Melasma (when used as part of a dermatologist-guided treatment plan).

How Does Kojic Acid Work?

To understand why Kojic Acid is effective, it helps to know how acne marks develop.

When a pimple becomes inflamed, your skin activates pigment-producing cells called melanocytes.

These melanocytes produce melanin, the pigment responsible for your natural skin colour.

During inflammation, melanin production can become excessive, leaving behind brown marks even after the acne has healed.

A key enzyme involved in this process is tyrosinase.

Kojic Acid works by inhibiting tyrosinase, reducing the skin's ability to produce excess melanin during the healing process.

The result is a gradual improvement in the appearance of post-acne pigmentation over time.

How Kojic Acid Helps Fade Acne Marks

The process can be simplified like this:

Step	What Happens
1	Acne causes inflammation.
2	Melanocytes become overactive.
3	Tyrosinase produces excess melanin.
4	Brown acne marks (PIH) develop.
5	Kojic Acid helps inhibit tyrosinase.
6	Less excess melanin is produced.
7	Existing acne marks gradually become less visible as the skin renews itself.

Because Kojic Acid targets pigment production rather than bacteria, it is intended for use after active pimples have started healing, not as a spot treatment for inflamed acne.

What Does Clinical Research Say About Kojic Acid?

Kojic Acid has been used in dermatology for many years as a tyrosinase inhibitor, making it one of the better-known ingredients for treating hyperpigmentation.

Clinical literature suggests that Kojic Acid can help improve conditions associated with excess melanin production, particularly when used consistently as part of a broader skincare routine that includes daily sun protection.

Dermatologists commonly recommend Kojic Acid in leave-on formulations for concerns such as:

Post-inflammatory hyperpigmentation (PIH)
Dark spots after acne
Uneven skin tone
Sun-induced pigmentation

Because pigmentation develops gradually, improvement also takes time. Consistent use, combined with sunscreen and a gentle skincare routine, generally provides better results than relying on any single ingredient alone.

Benefits of Kojic Acid for Acne Marks

When used consistently, Kojic Acid may help:

Improve the appearance of brown post-acne marks.
Promote a more even-looking skin tone.
Reduce the appearance of stubborn dark spots.
Complement other pigmentation-correcting ingredients.
Support a brighter overall complexion.

Unlike physical scrubs that simply exfoliate the skin, Kojic Acid addresses pigmentation at its source by helping regulate melanin production.

Kojic Acid is most suitable for people dealing with flat brown acne marks, medically known as Post-Inflammatory Hyperpigmentation (PIH).

If your acne has healed but left behind dark spots that make your complexion look uneven, Kojic Acid can be a valuable addition to your skincare routine.

It may be particularly beneficial if you have:

Brown or dark acne marks.
Uneven skin tone after breakouts.
Mild to moderate post-acne pigmentation.
Acne-prone skin with healed blemishes.
Skin concerns related to excess melanin production.

However, Kojic Acid is not designed to treat active inflamed pimples or deep acne scars.

If your skin has indented or raised scars, treatments such as microneedling, laser resurfacing, or subcision are usually more appropriate.

Who Should Be Careful When Using Kojic Acid?

Although Kojic Acid is generally well tolerated in properly formulated skincare products, it may not be suitable for everyone.

You should introduce Kojic Acid gradually if you have:

Sensitive skin.
A compromised skin barrier.
Active eczema or dermatitis.
Recently undergone chemical peels or laser treatments.

If you experience persistent redness, burning, or irritation, discontinue use and consult a dermatologist.

A patch test before first use is always recommended.

Kojic Acid vs Niacinamide for Acne Marks

One of the most common questions is whether Kojic Acid is better than Niacinamide.

The answer is that they work differently and often complement each other rather than compete.

Kojic Acid	Niacinamide
Helps reduce excess melanin production	Helps reduce pigment transfer
Targets brown acne marks (PIH)	Helps improve pigmentation and supports the skin barrier
Works mainly on pigmentation	Supports oily, acne-prone skin while improving uneven tone
May cause mild irritation in some users	Generally suitable for most skin types

Rather than choosing one over the other, many dermatologists prefer combining ingredients that work through different mechanisms.

This is why combination formulations are becoming increasingly popular for post-acne pigmentation.

Kojic Acid vs Vitamin C

Vitamin C and Kojic Acid are both brightening ingredients, but they work differently.

Kojic Acid	Vitamin C
Primarily targets excess melanin production	Powerful antioxidant that helps brighten the skin
Best for stubborn brown acne marks	Best for dullness and mild pigmentation
Often used in evening routines	Frequently used in morning routines under sunscreen

Both ingredients can be incorporated into a skincare routine, depending on your skin's tolerance and the formulation.

Can You Use Kojic Acid with Niacinamide?

Yes.

In fact, Kojic Acid and Niacinamide are often considered complementary ingredients because they target different stages of pigmentation.

Kojic Acid

Helps inhibit tyrosinase.
Reduces excess melanin production.

Niacinamide

Helps reduce the transfer of melanin to the skin's surface.
Strengthens the skin barrier.
Helps regulate excess oil.

Together, they provide a more comprehensive approach to post-inflammatory hyperpigmentation than either ingredient alone.

What Makes This Combination Effective?

Think of pigmentation as a multi-step process.

Pigmentation Stage	Ingredient That Helps
Excess melanin production	Kojic Acid
Melanin transfer	Niacinamide
Skin barrier recovery	Vitamin B5
Hydration and comfort	Hyaluronic Acid and humectants

Instead of relying on a single ingredient, addressing multiple pathways may help create a more balanced skincare routine.

How to Use Kojic Acid for Acne Marks

Consistency is more important than applying large amounts of product.

Evening Routine

Cleanse your face with a gentle cleanser.
Pat your skin completely dry.
Apply a few drops of your Kojic Acid serum.
Follow with a moisturiser to help maintain the skin barrier.

Many people prefer using Kojic Acid at night because it fits easily into an evening routine and encourages regular sunscreen use during the day.

Morning Routine

If your Kojic Acid product is suitable for daytime use:

Gentle Cleanser
Kojic Acid Serum (if directed by the product)
Moisturiser
Broad-Spectrum Sunscreen (SPF 30 or higher)

Daily sunscreen is essential because UV exposure can stimulate melanin production and reduce the visible improvement of post-acne pigmentation.

Can You Use Kojic Acid Every Day?

Most well-formulated Kojic Acid serums are designed for regular use.

However, if you're new to active skincare ingredients:

Start 2–3 evenings per week.
Observe how your skin responds.
Gradually increase frequency if well tolerated.

People with sensitive skin may benefit from introducing the ingredient more slowly.

Common Mistakes When Using Kojic Acid

Even a well-formulated product may not deliver the expected results if it is used incorrectly.

Common mistakes include:

Expecting overnight improvement.
Skipping sunscreen.
Applying Kojic Acid to broken or irritated skin.
Using multiple exfoliating acids in the same routine without guidance.
Picking active pimples.
Frequently switching between different pigmentation serums.

A simple, consistent skincare routine usually produces better long-term results than using several strong active ingredients together.

How Long Does Kojic Acid Take to Work?

Kojic Acid works gradually because pigmentation fades as your skin naturally renews itself.

The exact timeline depends on:

The depth of pigmentation.
Your skin type.
Daily sunscreen use.
Consistency of application.
Whether new acne continues to develop.

Skin Concern	Typical Timeline*
Fresh acne marks	4–6 weeks
Mild PIH	6–12 weeks
Moderate pigmentation	2–4 months
Stubborn acne marks	3–6 months

*Results vary between individuals and depend on consistent skincare and sun protection.

For a more detailed explanation, read How Long Does It Take to Fade Dark Spots?

How to Choose the Best Kojic Acid Serum for Acne Marks

Not every Kojic Acid serum is formulated the same way. While Kojic Acid is the hero ingredient, the overall formulation plays a major role in how effective and well-tolerated the product is.

Before buying a Kojic Acid serum, consider the following factors.

1. Ingredient Concentration

Dermatologists commonly recommend leave-on formulations containing 1% to 2% Kojic Acid. Higher concentrations do not necessarily deliver better results and may increase the likelihood of irritation, especially for sensitive skin.

2. Supporting Ingredients

A well-formulated serum should combine Kojic Acid with ingredients that complement its action.

Look for formulations containing:

Niacinamide
Vitamin B5 (Panthenol)
Hyaluronic Acid
Glycerin
Barrier-supporting humectants

These ingredients help improve skin comfort while supporting the treatment of post-acne pigmentation.

3. Lightweight Texture

If you have oily or acne-prone skin, choose a lightweight, non-greasy serum that absorbs easily without leaving a heavy residue.

4. Barrier Support

Since pigmentation treatments are often used for several weeks or months, maintaining a healthy skin barrier is essential.

Hydrating and soothing ingredients help improve tolerability and reduce the risk of dryness.

What Makes an Effective Acne Mark Serum?

Instead of relying on one ingredient, many modern formulations combine multiple clinically relevant actives.

Ingredient	Primary Function
Kojic Acid	Helps reduce excess melanin production by inhibiting tyrosinase
Niacinamide	Helps reduce pigment transfer and supports the skin barrier
Vitamin B5	Helps soothe skin and support barrier recovery
Hydrating Ingredients	Help maintain moisture and improve skin comfort

This multi-ingredient approach addresses several stages of post-inflammatory pigmentation rather than focusing on a single pathway.

QTWAYS Recommendation for Post-Acne Marks

If you're looking for a serum that combines multiple clinically relevant ingredients for post-acne pigmentation, consider choosing a formulation that includes both pigment-correcting and barrier-supporting ingredients.

The QTWAYS 10% Niacinamide + 1% Kojic Acid Face Serum is formulated with:

10% Niacinamide to help reduce pigment transfer and support the skin barrier.
1% Kojic Acid to help reduce excess melanin production.
Vitamin B5 to help soothe and support the skin.
Hydrating ingredients that improve skin comfort during regular use.

Its lightweight texture makes it suitable for acne-prone skin, and it can be incorporated into a consistent skincare routine alongside daily sunscreen.

Frequently Asked Questions

Does Kojic Acid remove acne marks?

Yes. Kojic Acid can help improve brown acne marks caused by Post-Inflammatory Hyperpigmentation (PIH) by reducing excess melanin production. It is not designed to treat indented or raised acne scars.

Does Kojic Acid work on acne scars?

No. Kojic Acid targets pigmentation rather than collagen remodeling. Deep acne scars usually require professional procedures such as microneedling, laser resurfacing, or subcision.

How long does Kojic Acid take to fade acne marks?

Many people notice early improvement after 4–8 weeks of consistent use, while more stubborn pigmentation may require 3–6 months. Individual results vary depending on skin type, severity of pigmentation, and daily sunscreen use.

Can I use Kojic Acid every day?

Most leave-on Kojic Acid serums are suitable for regular use when introduced gradually. If you have sensitive skin, start with a few applications per week and increase frequency as tolerated.

Should I use Kojic Acid in the morning or at night?

Many people prefer using Kojic Acid at night. If your product is suitable for daytime use, always apply a broad-spectrum sunscreen as the final step of your morning routine.

Can I use Kojic Acid with Niacinamide?

Yes. These ingredients complement each other because they work through different mechanisms. Kojic Acid helps reduce melanin production, while Niacinamide helps reduce pigment transfer and supports the skin barrier.

Can Kojic Acid be used with Vitamin C?

In many routines, yes. Vitamin C provides antioxidant support and brightening benefits, while Kojic Acid targets excess melanin production. Introduce new actives gradually and monitor your skin's tolerance.

Is Kojic Acid suitable for oily skin?

Yes. Lightweight Kojic Acid serums are generally suitable for oily and acne-prone skin, especially when combined with ingredients such as Niacinamide.

Is Kojic Acid safe for sensitive skin?

It can be used by some people with sensitive skin, but patch testing and gradual introduction are recommended. If irritation persists, discontinue use and consult a dermatologist.

Do I still need sunscreen while using Kojic Acid?

Yes. Sunscreen is essential because UV exposure can stimulate melanin production and reduce the effectiveness of pigmentation treatments.

Key Takeaways

Question	Answer
Does Kojic Acid help acne marks?	Yes, especially brown PIH.
Does it remove acne scars?	No, scars require collagen-remodeling treatments.
How does it work?	Helps inhibit tyrosinase, reducing excess melanin production.
Can it be paired with Niacinamide?	Yes, they work through complementary pathways.
How long does it take?	Around 4–8 weeks for early improvement; longer for stubborn pigmentation.
Is sunscreen necessary?	Yes, every day.

Conclusion

Kojic Acid is one of the most researched ingredients for treating post-inflammatory hyperpigmentation (PIH) and can be an effective option for improving brown acne marks. By helping inhibit tyrosinase—the enzyme involved in melanin production—it addresses one of the key biological processes behind post-acne pigmentation.

However, Kojic Acid is not a treatment for indented or raised acne scars. If your concern is textural scarring rather than discoloration, professional treatments such as microneedling or laser resurfacing are generally more appropriate.

For many people, the most effective approach is not relying on Kojic Acid alone but using it in a well-formulated routine alongside complementary ingredients such as Niacinamide, Vitamin B5, and hydrating agents, while applying a broad-spectrum sunscreen every morning.

The QTWAYS 10% Niacinamide + 1% Kojic Acid Face Serum combines these evidence-backed ingredients in a lightweight formulation designed for acne-prone skin. By pairing Kojic Acid with Niacinamide, Vitamin B5, and hydrating ingredients, it supports a comprehensive approach to improving post-acne pigmentation while maintaining the skin barrier.