Chemicals in hair dyes may cause allergies for some people. Around 38% of people who color their hair report having an allergic reaction to hair dye. The most common allergic reaction to hair dye is ...
Dogs can get allergies just like people do and there are many ways in which the allergy can show itself. Some allergic pets will have respiratory symptoms. Another form of allergy involves the ...
Background: Finding alternative hair dyes for individuals allergic to para-phenylenediamine (PPD) has been difficult. Newer permanent and demipermanent hair dyes that have replaced PPD with para ...
The vast majority of reactions to hair-dye products are caused by PPD. [4–6] In past years, PPD was used in permanent hair dyes but not in semipermanent dyes. More recently, PPD has been used in ...