Does Kojic Acid Cause Hyperpigmentation?

Evidence-based guidance on kojic acid and its risk of triggering or worsening dark spots, melasma, and post-inflammatory hyperpigmentation.

Risk level

MODERATE risk

Kojic acid brightens by inhibiting tyrosinase, but it is a known contact sensitizer and can cause irritation or allergic dermatitis — which may lead to PIH in sensitive individuals.

How it can affect pigmentation

Tyrosinase inhibition (brightening)
Contact sensitization and irritation
Post-inflammatory hyperpigmentation from allergic reactions

Usage advice

Patch test before regular use. Avoid combining with other strong actives initially. Use at night if irritation occurs.

Recommendations

Patch test on the jawline for 48 hours.
Start with lower concentrations and moisturize well.
Always use sun protection if your skin tends to hyperpigment; we recommend a zinc oxide sunscreen.

Sources

Kojic acid in skin care products. Burnett CL, et al. Int J Toxicol. 2010;29(5 Suppl):211S-219S. link

Related ingredients

Alpha Arbutin Azelaic Acid Hydroquinone

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