
Dapsone, Azelaic Acid, Tranexamic Acid: Why Hydroquinone Is No Longer First-Line for SoC PIH
Hydroquinone has been the default first-line PIH treatment for thirty years. In 2026, three actives — dapsone, azelaic acid, tranexamic acid —…
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The Elelaf Journal
Microbiome science, ingredient explainers, and routines that fit a real life. FDA-approved, dermatologist-reviewed.
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Hydroquinone has been the default first-line PIH treatment for thirty years. In 2026, three actives — dapsone, azelaic acid, tranexamic acid —…

Niacinamide blocks melanosome transfer from melanocytes to keratinocytes. It does not shut down melanogenesis itself. That mechanism puts a hard ceiling on…

Almost every published clinical trial on topical vitamin C used Fitzpatrick I-II patients. The extrapolation to oily, acne-prone, Fitzpatrick V skin doesn't…

Retinaldehyde is roughly 11× more potent than retinol with comparable irritation. The reason it's underused isn't clinical — it's supply chain economics.

Most published 'post-laser care' guides were written for Fitzpatrick I-III patients. SoC patients have a 90-day PIH risk window, not 14, and…

Benzoyl peroxide treats acne and causes hyperpigmentation in darker skin tones. The concentration that minimizes the trade-off has been known since 1986…
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