The vast majority of reactions to hair-dye products are caused by PPD. [4–6] In past years, PPD was used in permanent hair dyes but not in semipermanent dyes. More recently, PPD has been used in most ...
Of the 28 patients allergic to PPD who were seen from October 2006 through October 2010, 16 (57.1%) tested negative to all of the other substances on the hair dye series. Eleven of the 28 patients ...
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