Kojic acid is a fungal-derived organic acid that inhibits tyrosinase, reducing melanin production and helping to fade hyperpigmentation, melasma, and dark spots. It is commonly used in topical depigmenting formulations.
| Reported effect | How often | Notes |
|---|---|---|
Contact dermatitis / skin irritation | Common | Redness, stinging, and itching, especially at higher concentrations or with prolonged use. |
Skin dryness and peeling | Common | May occur as the skin adjusts, particularly in sensitive skin. |
Allergic contact sensitization | Uncommon | Kojic acid is a recognized contact allergen and can cause delayed hypersensitivity reactions. |
Increased photosensitivity | Uncommon | Treated skin may be more reactive to UV; sun protection is advised. |
Erythema or post-inflammatory hyperpigmentation | Rare | Paradoxical darkening can occur with irritation, more likely in darker skin tones. |
Systemic effects | Very rare | Topical use is not associated with significant systemic toxicity at cosmetic concentrations. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.