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    GlossaryParaphenylenediamine

    chemical in hair dyes that can cause allergic reactions

    Paraphenylenediamine (PPD) is a chemical commonly used in hair dyes to achieve long-lasting color. It is known for its ability to penetrate the hair shaft and provide a natural-looking color, but it can also cause allergic reactions in some individuals, leading to skin irritation or more severe responses.

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      research Regulatory News Related to Cosmetic Products

      4 citations , March 2007 in “Annales de Dermatologie et de Vénéréologie”
      Hair care products can cause skin irritation and allergies due to certain chemicals.
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      January 2001 in “Clinical and Experimental Dermatology”
      A test for nail fungus was most accurate with PAS stain, low-dose spironolactone helped two-thirds of acne patients, metformin reduced symptoms of HIV-related fat distribution changes with some side effects, and skin examination with dermoscopy was better at detecting abnormal moles, while temporary tattoos can cause skin reactions.

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