Difficult to say: Most rashes are not emergencies & get better on their own without treatment. If this came on suddenly & itches it could be a mild allergy to something she came in contact with. It could also be from a viral illness, especially if she has other symptoms of illness. Less likely is insect or bug bites, if it's widespread. Bites are usually more isolated. Age/weight-based Benadryl (diphenhydramine) can help w/ itch.
Answered 9/6/2016
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