Dyehigh risk Common irritant
Paraphenylenediamine
INCI · p-Phenylenediamine
A permanent hair dye ingredient. One of the most common causes of allergic contact dermatitis from cosmetics.
Why dermatologists flag it
Leading cause of hair dye allergies, can cause severe reactions
Names to look for on labels
Paraphenylenediamine appears under any of these names — manufacturers choose between INCI, common, and local-language terms freely.
p-PhenylenediaminePPDCI 76060para-Phenylenediamine1,4-Benzenediamineपैराफेनीलीनडायमाइन
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