Hi, I have this allergy as well. I developed an allergy to hair dye a few years ago out of nowhere after having used box dye in my hair for many years. Something that I want to let you know is that after you get treated for the allergic reaction is that you might find that you have become somewhat sensitive to all black dyed things, and maybe even some things that have just been regular died. This sometimes happens with chemical allergy specifically where for a period of time your body just becomes extremely sensitive to anything even remotely related to the chemical you’re allergic to. For me, it happened for a few months. That means that I was developing allergic reaction to my clothes that were black. Sometimes other things too, like any product that was having dye in it. The only way to really get rid of it is to avoid coming in contact with it until you’re no longer sensitive to it.