Body piercing and tattoos are out; wild hair colors like shocking pink and electric blue are in. It’s the latest fashion statement. But the teens may be getting more than they bargained for; an itchy, flaking rash resembling poison oak can develop on the face or scalp.

This rash, called contact dermatitis, is a result of the immune system reacting to para-phenylenediamine(PPD), a chemical commonly found in hair dyes. Two-thirds of hair dyes currently contain PPD., which is responsible for the problems. More people are experiencing positive allergic reactions on patch testing.

 Researchers have warned that coloring your hair can lead to dermatitis, not only on your head, but on your face. It can also lead to a swollen face in severe cases.

And it is happening at a younger and younger age, even among preteens. First time users can greatly reduce their risk of allergic reactions by conducting a skin sensitivity test 48 hours before coloring their hair.

Adults can benefit from this advice, too.

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