What should you know about function of kojic acid?

Skin pigment is produced through a pathway that includes an enzyme involved in melanin formation. Kojic acid interferes with that pathway when applied topically, which can make newly forming excess pigment less noticeable over time. It does not erase every cause of discolouration, and it does not prevent new darkening from sun exposure, inflammation, hormones or an untreated skin condition.

Results depend on the type and depth of pigmentation, the formulation, how often it is used and how well the skin tolerates it. Irritation can itself leave darker marks in some skin tones, so stronger application is not automatically better.

Use the product exactly as directed and introduce it cautiously, especially if your skin is sensitive or you also use exfoliating acids, retinoids or other brightening ingredients. Apply sun protection during the day because ultraviolet exposure can maintain or deepen pigmentation. Stop and seek advice if burning, swelling, blistering or a persistent rash develops. A clinician can help identify whether the mark is melasma, post-inflammatory pigmentation or another condition before treatment is chosen.

Arrange a dermatology review when pigmentation changes quickly, bleeds, becomes painful, forms a sore, or looks unlike the surrounding marks. Seek help for persistent irritation or worsening darkening after starting kojic acid. A new or changing spot should not be assumed to be a cosmetic concern from colour alone.

Ask what is causing the pigmentation, whether kojic acid suits your skin, which products should not be combined with it, and how to recognise irritation before it causes further colour change. Ask how long to try the product before reassessment.