Since fexofenadine (Allegra) did not help, you can safely try non-medicinal relief. Applying cool compresses or taking a lukewarm oatmeal bath can soothe the itching. For topical relief, a mild hydrocortisone cream is generally safe to use while breastfeeding, just ensure it is not applied near the breast area where your baby could contact or ingest it. Because your rash is severe and did not respond to the antihistamine, please consult a healthcare provider promptly to safely diagnose and treat the underlying cause.
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What can I safely take or do to treat a severe skin rash that did not improve after taking Allegra 120, since I am breastfeeding my one-year-old?