My daughter, who is 2.5 years old, has just experienced 6 days of diarrhea . She has stayed hydrated, and been in good spirits, and while the diarhea has gone away, she now is having a rash come and go, mostly on her hands and feet . It is itchy, and painful. Her skin looks pretty normal, but occasionally, the red rash shows white spots, smaller than a bug bite . What could be causing this?