What's causing this crop of papules?

Tristan, a 34-year-old optician, presents with a recent onset of a pruritic, yellow and erythematous rash on his left shoulder.

Test your clinical know-how by taking the quiz below. If you select the wrong answer, have another go — you can try as many times as you like!


Dr Paul Muthiah is GP on the Central Coast, NSW, and medical co-editor at Australian Doctor.

  1. Dermnet NZ; last updated Oct. 2020