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Psychology expanded so that if you have an allergy , or asthma , or you are obsessive , or compulsive , this has a psychological origin . Do not use sodium sulfacetamide and urea topical without first talking to your doctor if you have an allergy to sulfa products . You may need to stop taking some medications , such as some tricyclic antidepressants and antihistamines such as cetirizine ( Zyrtec ) , fexofenadine ( Allegra ) , and loratadine ( Claritin ) before you have an allergy skin test .