6th February 2024

A 65-year-old female presents to the dermatology clinic with recurrent blisters.

A 65-year-old female presents to the dermatology clinic with recurrent blisters. These begin with small blisters along her face, hands and forearms that progress into ulcers. These heal within a few days, leaving behind small yellow-white papules in their place. She denies any other associated symptoms. Elevated urinary porphyrin levels are detected with normal urinary ALA levels.

Which of the following products will likely be elevated in this patient?