excon... What part of your body breaks out.
My daughter used to break out so bad that once she ended up in a wheel chair for about 2 weeks. They thought her foot and one leg was going to be covered in scars but as soon as the rash/hives disappeared her the skin returned to normal. It took about 4 weeks to run its course.
This has happened to her a few times but the one was the most severe. There was another time that her face was so swollen that she was unreconizable to her teachers and classmates.
This started when she was around 5 and the last break out was around the age of 10. She is almost 15. The poor baby freaks out if she gets a bump on her skin. She was given predisone, yeast infection medication, hydrocortisone, benadryl and nothing really helped, it would run its course and she would get OK in a few weeks.
The dermatologist did all types of test and skin biopsy and could never figure out why.
I have a determology website that you could check out... I have at least identified the way some of her rash/hives looked.
DermAtlas: Dermatology Image Atlas with 10490 Dermatology Images
Here is some is another site you may find informative
Nettlerash, hives, urticaria
I just hope if this ever happens again, that research has come further along and she can get some relief.