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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.I am sorry for her symptoms.
Does she have any other symp***** *****ke fever?
Did she have any test?
I was waiting for your reply.The symptoms sound like an allergy.Cause is often difficult to find.Response to allergen varies from person to person. Other probable is an infection.Viral infection can cause rash.But response to benadryl & cortisone suggests an allergy.
If the symptoms recur, she can have blood work, allergy tests.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish her healthy life.Regards.