Men are more likely than women to suffer from allergic reactions to hair dyes.
Years ago, it was only our grandmothers who colored their hair, but times have changed.
British researchers looked at the frequency of hair dye allergies.
In a six year period, they found men were two times more likely than women to develop allergies.
The apparent culprit is a compound called PPD which is in about two-thirds of dyes on the market.
It can cause dermatitis on the face and in severe cases, facial swelling.