Dark Knees & Underarms Dark Underarm Hyperpigmentation Hyperpigmentation on Body Kojic acid Kojic Acid Soap

Kojic Acid Soap | Skin Lightening Treatment

May 17, 2021

Hi everyone, my name is Rita, and today we will be talking about kojic acid-specifically kojic acid soap. Before we get into that, let’s look at what kojic acid is and what it does.

Kojic acid works by inhibiting the formation of tyrosine. Tyrosine is an amino acid needed to produce melanin. Because it prevents the production of melanin, kojic acid causes the skin to lighten. As a result, it is often used to treat hyperpigmentation, sun damage, age spots, and scars.

Does kojic acid come in other forms, or is it just the soap form? No, Kojic acid comes in different forms, including lotions, creams, serums, peels, and soaps.

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Today, we’ll be discussing the kojic acid soap; I genuinely appreciate how fast-acting, as well as how accessible it is. A brand that I’ve used for a while now is Kojie San, and we’ll be using it for our demo in today’s video.
In this segment, we’ll be looking at using kojic acid soap, how often to use it, where to use the soap, its side effects, things to know about it, and when to expect results.

1. How to use kojic acid soap? Wet the soap and work it into a lather, then apply it to the affected area. Leave it on for about 30 seconds, and wash off. Some have said that this soap can be left on for as long as 4 minutes, but remember that this soap has a very high irritation potential, so don’t leave it on for long.

2. How often should you use the soap? First, if you have sensitive skin, you may want to do a patch test to see how your skin reacts. Then you can start using it every other day. Some people can use it every day with no issues; other people’s skin can even tolerate it twice a day. If you use retinoids, your skin may have trouble handling them every day.

3. Where to use the soap? It can generally be used anywhere you have hyperpigmentation: Face, Body, Elbows, Knees, thighs..etc..

4. Side effects? Redness, irritation, itchiness, or pain and discomfort. When you experience these, you should stop use. I know that I’ve overused it, and I take a break.

5. Things you need to know? *Kojic acid soap, especially this one by Kojie San, tends to dissolve quickly in water, so cut it into pieces; otherwise, it’s going to last you about two days.*Kojic acid soap can be very drying for some, so moisture up. Unlike the many actives that pregnant women are prohibited from using, kojic acid is safe for expecting and nursing mothers.

6. When to expect results? All things being equal, and if you’ve been using the soap consistently, you’ll likely start to see results within two-four weeks. For faster results, combine with glycolic acid.


Adams, C. (2020, October 29). Less Is More: How to Use Kojic Acid, the Hyperpigmentation Eraser. Greatist. https://greatist.com/health/kojic-acid

Gotter, A. (2017, August 17). Kojic Acid. Healthline. https://www.healthline.com/health/kojic-acid

Scientific Committee on Consumer Safety. (2012). Opinion on kojic acid. ec.europa.eu/health/sites/health/files/scientific_committees/consumer_safety/docs/sccs_o_098.pdf

Lajis AF, et al. (2012). Depigmenting effect of kojic acid esters in hyperpigmented B16F1 melanoma cells.hindawi.com/journals/bmri/2012/952452

Kojic acid. (2020).pubchem.ncbi.nlm.nih.gov/compound/Kojic-acid

Burnett CL, et al. (2010). Final report of the safety assessment of kojic acid as used in cosmetics. DOI:10.1177/1091581810385956

Garcia A, Fulton JE Jr. The combination of glycolic acid and hydroquinone or kojic acid for the treatment of melasma and related conditions. Dermatol Surg. 1996 May;22(5):443-7. doi: 10.1111/j.1524-4725.1996.tb00345.x. PMID: 8634807.

Disclaimer: All content on this blog is for informational purposes only and is not intended to substitute advice from your physician or other healthcare professionals.

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