How do I know if I have had a reaction to a skin test?

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I wondered if you could give me some quick advice. I just had a skin test done for a hair dye and it's left a red patch on my skin which is not itching.

Is this a reaction?

Anon, UK

This could possibly be a reaction to the colour. If you are worried then go and have it tested again probably on a different area to where you had it last time. Behind the ear is best as it is the skin that is closest to the scalp.

If then it still reacts, unfortunately you may have developed an allergy to hair colours and I would avoid using them in the future.

John Clark at Brooks+Brooks, London 

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