What is the ingredient used contained by tresses dye that some associates are allergic too?

My mum is allergic to something they put in hair dye which they never when she was my age (in the 80s) her obverse swells up terribly. I want to dye my hair but i dont want to risk it because it is apparantly quite dangereous.
is it that cause this for some people, and what products use it?
Answers:    I think Ammonia is the ingredient that causes adjectives that irritation.

I'm not exactly sure why some people have a bad counterattack to it. I guess it's just like anything else you could be allergic to; dairy products, bee stings etc.

ould be the Ammonia or PPDs (Paraphenylenediamines - pigments) The peroxide can cause problems too.

I suffered a lot of hair loss and injure through colouring.

I now buy only hair colouring products made by this company:

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