My 6 Year Old Daughter Has A What Looks Like

my 6 year old daughter has a what looks like a rash on her body,mainly on her face but now spreading to the rest of her body in splotches. her face is swollen around her eyes severely and now her hands have begun to swell. took her to the er and they said its impetigo but it doesn't look like that. any suggestions on this or what I might need to do? tammie