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Azelaic Acid Is the Brightening Active That Makes Sense Under SA Sun

By Michael C. · Written and reviewed by Michael C.

Hyperpigmentation · Published 2026-09-06 · 9 min read · 2004 words · Updated 2026-09-08

Twenty percent azelaic acid has been compared with four percent hydroquinone for melasma. Under extreme UV it still only works if SPF comes first.

Key takeaways

  • Azelaic acid has evidence for melasma and PIH on deeper skin tones.
  • Results take weeks; SPF and heat management decide whether marks stay faded.
  • Skip unregulated lightening creams; use labelled products and clinical guidance for stubborn pigment.

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Source: Drugs in Context / International Journal of Dermatology (https://pmc.ncbi.nlm.nih.gov/articles/PMC9165630/)

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