Hi,
Sudden onset of raised, red and itchy rash over body indicates an acute
urticaria. This can be a manifestation of
allergy to some insult (but unlikely to your diet), a viral illness or to an infection somewhere in the body.
But, since she do not have fever or other symptoms now, we need not worry. Just apply
calamine lotion over the lesions 2 times a day for 3-5 days. If it is not coming down by then, or if she develops fever, kindly take to her to
pediatrician, as this will need antihistamines and
steroids for few days along with treatment of any infection.
Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Muhammed Aslam T. K., Pediatrician