I've been having my hair coloured dark brown at the hairdressers for years with absolutely no problems. Due to cutting back on finances, I coloured my hair at home using a Nice and Easy medium brown 24 washes colour. Stupid me didn't do the patch test and my face blew up like a balloon for a few days. Luckily, I was OK and will never use that colour again but I'm now terrified of home hair dyes. I plan to save up and get my hair coloured at a salon but wonder if I'll now have a bad reaction to the salon colour too, even though I never did previously, or is there something in home hair dyes that can cause an allergic reaction that won't be in salon dyes?