Derm Dx: A rare type of urticaria

A 30-year-old man presents with a 5-year history of an episodic rash. The pruritic rash typically appears 10 to 15 minutes after an episode of stress or anxiety and lasts approximately 30 minutes to 1 hour. During these episodes, he also experiences heart palpitations. On examination, numerous urticarial papules and plaques surrounded by a pale halo are noted over the ...