9th June 2025

A 40-year-old male patient presents with urticaria that has lasted more than 6 weeks.

A 40-year-old male patient presents with urticaria that has lasted more than 6 weeks. The individual lesions have faded and reappeared in different areas. No obvious trigger is identified from the history. He has hypertension and is on candesartan, but has no other past medical history and no known allergies. Which of the following is the most likely diagnosis?