<i>p</i>‐<scp>P</scp>henylenediamine and other allergens in hair dye products in the<scp>U</scp>nited<scp>S</scp>tates: a consumer exposure study

Abstract

Potent contact sensitizers were almost universally included in the hair dyes investigated in the United States. Although PPD is a common allergen, resorcinol and m-aminophenol were found more frequently. In total, 30 potent sensitizers were found. Clinicians should consider other allergens in addition to PPD when evaluating patients with suspected hair dye allergy.