Azelaic Acid

What the evidence says

Azelaic acid is a naturally occurring dicarboxylic acid used topically rather than an exfoliating alpha-hydroxy acid. A systematic review of 43 randomized trials found benefit over vehicle for acne, papulopustular rosacea, and melasma, while finding no eligible randomized evidence for skin aging.^[1]

For rosacea, the strongest evidence concerns inflammatory papules and pustules, not persistent redness or visible blood vessels. An earlier systematic review found 15% to 20% azelaic acid superior to vehicle and broadly comparable with topical metronidazole; the FDA label for 15% gel is similarly limited to inflammatory lesions of mild-to-moderate rosacea.^[2][5]

Acne trials support reductions in inflammatory and noninflammatory lesions, although network evidence does not establish azelaic acid as universally superior to retinoids, benzoyl peroxide, or combination treatment. For melasma, a meta-analysis found similar overall outcomes to hydroquinone, with uncertainty from small and heterogeneous trials.^[4][3]

Burning, stinging, itching, dryness, and irritation are the main limitations, particularly during the first weeks. Rare hypopigmentation has been reported, so changes in skin color warrant review. The Moderate rating applies to the named skin conditions and should not be read as evidence for wrinkle reduction, scar removal, or generalized rejuvenation.^[5][1]