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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Please upload a pic of the rash here. Fever and painful rash do suggest some type of infection.
Thanks for the picture.Yes this can be from heating pad. The pain is likely due to the neck muscle strain commonly sustained from faulty sleeping position. Also dehydration from fever and vomiting can make muscle more tired prone for strain. This likely viral infection. Tylenol, fluids, rest should be helpful. Ibuprofen also may be used as stronger anti inflammatory.
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