Are you putting a chemical used in photocopier ink and rubber products on your head. As it turns out, possibly. Paraphenylendiamine (dare you to say it quickly three times in a row) is commonly found in hair coloring products.
Though PPD supposedly contains low toxicity levels, it is a serious allergen that should not have direct contact with skin. A potential side effect of PPD include mild contact dermatitis on the forehead, eyelids and ears, which usually occurs while oxidizing.
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