I did a patch test using Garnier Nutrisse a few months ago, and there was an immediate reddening & slight puffing on the place I put it which completely disappeared as soon as I washed it off (or within a few minutes).
I've been using this brand for ages & usually had a stinging sensation on my scalp which I could cope with because it stopped as soon as I rinsed and there were no added problems.
Now, since the patch test, I got a bit scared and stopped dying my hair altogether....so I have loads of greys at the moment which I fecking hate :(
I've read online that this was not a "true" allergic reaction because it came up instantly, didn't affect anywhere other than the place it touched, and went as soon as it was rinsed away.
I am willing to put up with stinging to get rid of my greys - so should I risk it?