Itchy scalp after using hair dye is a common issue that can be caused by the chemicals in the dye. Many hair dyes contain ingredients that can irritate the skin or cause an allergic reaction, such as paraphenylenediamine (PPD), which is a known irritant and allergen
. When the dye sits on the scalp, the chemicals can burn the surface, leading to an itchy rash
. Some of the potentially scalp-irritating ingredients in hair dye include ammonia, phthalates, sodium lauryl sulfate, and sodium laureth sulfate
. If you experience an itchy scalp after using hair dye, it's important to thoroughly rinse out the dye from your hair and scalp and avoid scratching to prevent further irritation
. If you know that you're allergic to certain chemicals or brands of hair dye, you can contact the manufacturer to ask about the chemicals in the product and if there is an alternative available in case of allergies
