Tretinoin Purge Not Improving? Azelaic Acid Could Be the Hidden Culprit

  • August 15, 2026
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When Tretinoin Irritation Won’t Quit, Look at What Else Is in the Routine Anyone who has started tretinoin knows about “purging” — the stretch of redness, flaking, and sometimes new breakouts that can show up in the first several weeks as skin cell turnover speeds up. The American Academy of Dermatology notes that retinoid-related irritation […]