Hi i got treated at my er last night for allergic reaction to hair dye and it's comes back today what should i do?

Allergic Reaction: I'm not sure what your treatment entailed last night. Hopefully, they gave you instructions for continued treatment. If they did not, then you need to return for care either to your regular physician, an urgent care or to the ER if you are having difficulty breathing, swallowing or closing up of your throat. If you just have a rash then I would take antihistamines until you can be seen.