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You won’t die if you don’t, but your skin might suffer: “The dyes, resins and finishes added to clothing can cause skin problems,” says Dr Mark Denis P. Davis, a dermatologist at the Mayo Clinic. For example, synthetic fabrics are often coloured with disperse dyes, which may trigger allergic reactions in up to 7% of the population. Natural fabrics, such as cotton, aren’t necessarily safer – they often contain irritating formaldehyde resins added by manufacturers to make the fabric resist wrinkling. Formaldehyde is also a carcinogen, but fortunately, a study from the US Government Accountability Office suggests that the small amount present in clothing isn’t enough to raise your cancer risk.