Patch testing: Quite a number of hair dyes are notorious allergens. If you read the small print on the dye , it warns of reactions. If you develop a rash and/or severe itching on your neck, upper back and/or your forehead and eyelids initially a week after dyeing your hair and with time the interval getting shorter, odds are significant. For diagnosis, see an allergist/immunologist for patch testing.
Answered 4/16/2014
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