9th June 2025

A 42-year-old man presents to the emergency department with a 2-month history of itchy hives that appear shortly after exercise.

A 42-year-old man presents to the emergency department with a 2-month history of itchy hives that appear shortly after exercise. On examination, there are multiple erythematous plaques on his arms and legs after a short bout of exercise that were not present previously. He complains of itch. Which of the following is the most likely diagnosis?