My 28 year old daughter developed a low-grade fever (99.9) yesterday; shortly after the fever, she developed an itchy rash on her torso (front and back), with a bit upon her upper arms and upper thighs. She no longer has the fever, but the itchy rash has persisted. She has a 5 year old daughter and a six year old son. Her son had a week-long fever (up to 103.4) two weeks ago, with no other symptoms than the fever; last week, her daughter had a week-long fever (up to 103.9). Three weeks ago (~Feb. 11), her daughter had a fever with a non-itchy rash. Any ideas?