4.3% Patch-Test Positivity for PPD Allergy in 7-Year Review
A 7-year UK patch test review found 4.3% PPD positivity, 4.9-year diagnostic delays, and cross-reacting amines in most "PPD-free" dyes and tints.
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Hair Dye Allergy
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A 7-year UK patch test review found 4.3% PPD positivity, 4.9-year diagnostic delays, and cross-reacting amines in most "PPD-free" dyes and tints.