Patrick Moreau
August 15, 2020
Open scalp sore? Paraphenylenediamine (PPD) is a chemical that is widely used as a permanent hair dye and guess what? It can wreak havoc on the skin. It’s also one of the most common causes of scalp allergic contact dermatitis (ACD), with the chemicals/fragrances included in shampoos and conditioners coming in right behind as a […]