Kojic Acid

Kojic acid is a naturally occurring compound produced by certain types of fungi during fermentation. It is commonly used in skincare products designed to treat hyperpigmentation, dark spots and uneven skin tone.

Kojic acid works mainly by inhibiting an enzyme called tyrosinase, which plays an important role in the production of melanin, the pigment responsible for giving your skin its colour.

By reducing tyrosinase activity, kojic acid can help reduce excess melanin production and gradually improve the appearance of pigmentation.

Kojic acid is primarily used to help manage hyperpigmentation, which is when certain areas of the skin become darker than the surrounding skin.

It may be used for:

• Dark spots
• Uneven skin tone
• Post-inflammatory hyperpigmentation
• Pigmentation following acne
• Sun-induced pigmentation
• Melasma

Kojic acid for melasma

Melasma is a common pigmentation condition that causes brown or greyish-brown patches, usually on the face. It can be influenced by factors such as sun exposure, hormones and genetic predisposition.

Research has found that kojic acid can help improve melasma, particularly when used as part of an appropriate pigmentation treatment plan. However, melasma can be persistent and may require a combination of treatments rather than relying on one ingredient alone.

Kojic acid for acne marks

Kojic acid may also help with brown marks left behind after acne.

However, it is important to understand that kojic acid does not treat active acne or remove physical acne scars such as ice-pick, rolling or boxcar scars.

If new acne continues to occur, new pigmentation may continue to develop. This is why treating the acne itself is also important when managing acne-related pigmentation.

Kojic acid mainly works by inhibiting tyrosinase, an enzyme involved in melanin production. In simple terms, think of tyrosinase as one of the important steps in the process of making melanin. By interfering with this process, kojic acid can reduce the formation of excess pigment.

This is why kojic acid is considered a depigmenting ingredient rather than simply a product that temporarily makes the skin look brighter.

Research reviews have identified tyrosinase inhibition as one of the main mechanisms responsible for kojic acid's effect on pigmentation.

There are a few important things to remember when using kojic acid:

• Kojic acid should be used according to the instructions for the particular product or as advised by your dermatologist.
• Avoid applying it to broken or irritated skin.
• If you have sensitive skin, introduce it gradually and monitor how your skin responds.
• Avoid using too many strong active ingredients together, as this can increase irritation.
• Always use sunscreen during the day when treating pigmentation.
• If you experience persistent redness, burning, itching or swelling, stop using the product and speak to a healthcare professional.

Most importantly, more product does not mean faster results. Excessive use can irritate the skin, and irritation may make pigmentation more noticeable.

The exact application depends on the type of kojic acid product you are using.

For a kojic acid cream or serum, a typical routine may look like this:

1. Cleanse your face gently and pat the skin dry.
2. Apply a small amount of the kojic acid product to the pigmented areas, following the product instructions.
3. Avoid the eye area, lips and broken or irritated skin.
4. Apply a suitable moisturiser if needed.
5. During the daytime, finish with a broad-spectrum sunscreen.

If you are using other active ingredients such as retinoids, exfoliating acids or other pigmentation treatments, it is best to check whether they should be used together.

Kojic acid does not usually produce overnight results. Pigmentation develops gradually, and improvement also takes time. Clinical studies have generally assessed kojic-acid-containing treatments over several weeks to a few months.

How quickly you see improvement will depend on factors such as:

• The cause and depth of pigmentation
• How long you have had it
• Your skin type
• The formulation and concentration being used
• How consistently you use the treatment
• Your exposure to sunlight

So, if you are using kojic acid for pigmentation, give your skin time rather than expecting results within a few days.

Kojic acid is generally well tolerated by many people, but it can cause irritation or sensitivity in some individuals.

Possible side effects include:

• Redness
• Dryness
• Burning
• Itching
• Irritation
• Contact dermatitis

If your skin becomes persistently irritated, stop using the product and speak to your dermatologist. It is also important to remember that skin irritation can sometimes worsen pigmentation, particularly in people who are prone to post-inflammatory hyperpigmentation. Therefore, aggressive use of pigmentation products is not necessarily better.

Whether kojic acid can be used every day depends on the concentration, formulation and your skin's tolerance. Some people may be able to use it regularly without problems, while others may need to use it less frequently.

If you are new to kojic acid, starting gradually can help you see how your skin responds. Always follow the instructions on the specific product or your dermatologist's advice.

If you are pregnant, breastfeeding or trying to conceive, it is best to speak to your doctor or dermatologist before using kojic acid-containing products. There is limited safety information regarding topical kojic acid during pregnancy, so a healthcare professional can help you decide whether it is appropriate for your individual situation.

For pregnancy-related pigmentation such as melasma, sun protection remains particularly important.

Yes — and this is one of the most important parts of pigmentation treatment.

Sun exposure can stimulate melanin production and make pigmentation more difficult to control. This is particularly important for people with melasma, which can easily recur.

Using kojic acid while continuing significant sun exposure is a little like trying to reduce pigmentation while simultaneously encouraging the skin to produce more pigment.

For this reason, use a broad-spectrum sunscreen every day and take additional sun-protection measures when needed.