Since cetirizine and Allegra aren't providing relief, she might find more comfort using a first-generation antihistamine like diphenhydramine, which can help reduce itching and aid sleep. Additionally, applying calamine lotion directly to the spots, taking lukewarm baths with colloidal oatmeal, and using cool compresses can greatly soothe her skin. Please encourage her to keep her fingernails short to prevent scratching and avoid skin infections. If her symptoms worsen or she develops a high fever, please consult a healthcare professional.
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What can my sister use to relieve severe itching from chickenpox since citirizine and Allegra are not working?