Suggest Treatment For Rash And Itching On Body

one of my daughter's friends was diagnosed with scabies but failed to tell us about it when she spent the night. now my daughter has a rash all over her body. doctor prescribed premithrin cream. treated, a week later treated again. still have the intense itching especially at night. the girl that spent the night and gave us the scabies said that her doctor told her to use bengay on the itchy spots. it this a viable treatment or does it just help with the itching? or does it do nothing at all?