My daughter, she s 11 years old, has suddenly developed hot, red, welts,on her arms and legs. They look like an allegic reaction but she hasn t been exposed to anything she may be allergic to. She just got out of the shower hoping that would help, maybe even by washing away anything that may have touched her skin. They are still there, and she thinks the welts are speading, and they do appear to be growing in larger patches. What do you think could be causing this. Earlier today she complained of a sore throat, but not again since this morning. Do you think I should take her to the hospital?