20th June 2023

An 81-year-old man with a known malignancy attends Oncology clinic reporting an itchy red rash across his back.

An 81-year-old man with a known malignancy attends Oncology clinic reporting an itchy red rash across his back. His wife states that it started as a small patch and has spread rapidly outwards over the course of the last few weeks. On examination, he has an erythematous, plaque-like scaly rash in concentric rings across his back forming a distinctive “wood grain” pattern.

What is the most likely dermatological condition?

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