Azelaic acid is a naturally occurring dicarboxylic acid used topically to reduce inflammation, normalize keratinization, and inhibit pigment formation. At around 5% it is a mild active for acne, rosacea, and post-inflammatory hyperpigmentation, though higher concentrations (15-20%) are more commonly studied therapeutically.
| Reported effect | How often | Notes |
|---|---|---|
Burning or stinging | Common | Transient sensation on application, usually mild and subsiding with continued use. |
Itching (pruritus) | Common | Localized to application site, generally mild. |
Erythema or skin irritation | Common | Mild redness and dryness, especially in early weeks of use. |
Peeling or scaling | Uncommon | Flaking from increased keratinocyte turnover. |
Contact dermatitis | Rare | Allergic or irritant reaction in sensitive individuals. |
Hypopigmentation | Rare | More of a concern on darker skin tones; lightening at application site. |
Worsening of asthma | Very rare | Isolated reports of respiratory symptoms following topical use. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.