What can I put on a bleach hair dye scalp burn?

I dyed my hair a lighter blonder then my natural hair colour the day before yesterday. then when I washed out the dye and put conditioner in I saw on my scalp a burn circle. I am really worried. When will it go and what can I treat it with? Can I use calamine lotion? I have prom tomorrow to :( and Im going to a salon to get my hair curl I'm scared they might see it :(