Phase 3 OptIMMize-1 findings show sustained skin clearance, itch reduction, and quality-of-life improvements with risankizumab through 52 weeks.
|Articles|June 1, 2001
Permanent hair dyes cause contact urticaria, anaphylaxis
Palm Beach, Fla. - Paraphenylenediamine, or PPD, the main chemical used in permanent hair dye colors, is the third most common cosmetic allergen, preceded by preservatives (No. 1) and fragrances (No. 2), James S. Taylor, M.D., said at annual meeting of the Noah Worcester Dermatological Society.
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