Most hair dyes contain an ingredient called para-phenylenediamine or PPD for short. This particular ingredient is included in hair dyes since this is responsible for giving coverage to hair and making it look darker. Also, PPDs are mostly found in permanent hair dyes. However, this ingredient can cause an allergic reaction to hair dye in […]
Skin allergies manifest as itchy, red patches, which are triggered by certain allergens. Learn more about the common triggers and causes here.