2nd July 2023

A 35-year-old man presents to clinic with an itchy rash on his back which developed 20 minutes after being outside in the sun

A 35-year-old man presents to clinic with an itchy rash on his back which developed 20 minutes after being outside in the sun. The rash was wheal-like with red, swollen, irregular shaped lesions across the back. The rash faded away within 2 hours of him being back inside the house.

What is the most likely diagnosis?

Select the SINGLE most appropriate option from the list below. Select ONE option only.