My Daughter Has A Rash From Head To Toe. The

My daughter has a rash from head to toe. the first visit to the ER, her hands were swollen 3 times their size. by the time she got to the hospital, her hands cracked and started oozing puss and blood. the gave her an IV with some kind of steroid antibiotic. the did not do a blood screen and assumed it was hand, mouth and foot disease. for the next couple of days she seemed to be doing better. then we had to go back to the hospital due to her throat swelling and the rash was covering from her neck to her toes. her neck and upper chest was oozing. they gave her a stronger antibiotic, steroid cream and pain meds. can you help me figure something out. she is in extreme pain.