Which color cancels out blue?

Was using a curling wand on Sunday now to see how the curls turn out and how to do it. Was listening to my iPod went to change the song and burnt my forhead. I've been using aloe lotion because this helps with Minor burns and put some on before I went to bed last night to wake up and find out it died the scab blue. Took a shower tried various things to et the blue off but nothing has worked. I have my sisters grade 12 grad tomorrow how can I get rid of this blue spot on my head and what color cancels put blue