Symptoms of an allergic reaction can include itching ... Mehendi's drying effect on the hair or the accumulation of dye ...

Women who regularly use permanent hair dye may be putting themselves at increased risk of bladder cancer, new research findings suggest. The study is the first to show that how often you use hair ...

Using natural dyes, limiting colouring frequency, and investing in proper hair care can minimise these risks. Changing your hair colour can be an exciting way to refresh your look and express your ...

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 ...

A chemical compound used in many permanent hair dyes has been named Allergen of the Year for 2025 by the American Contact Dermatitis Society (ACDS). Toluene-2,5-diamine sulfate (PTDS) is an ...