My 17 Year Old Daughter Has A Rash. It Started

My 17 year old daughter has a rash. It started with a small red bump on her forehead. Almost like a pimple. Within a couple days that spot grew to the size of a nickel. Very inflamed with a pustular in the middle that oozes a clear to yellow liquid. She now has them all over her body. They will itch in waves. She can go without any itching to severe itching. She also says they hurt. Every day there are 1-3 more spots. Our local providers are stumped. They did take blood on Friday. We are waiting for the results. Antibiotic ointments seem to exacerbate the symptoms. I had her take a Benadryl tonight as she is itching more than usual. This was after she had taken a shower. Makes me think the hot water intensifies the itch.