Hi, you need to cold compress the area. Any sign of it progressing or your breathing being affected call for medical assistance. Is someone with you? I am a hairdresser and have seen some reactions progress very quickly. Didn't you skin test?
Dyed my hair tonight, the nape of my neck is extremely itchy, Also around the hair at my ear. Have taken anti histamine, have few spots at nape of my neck, only small and due to the dye. Sounds daft but will i be ok?