What's behind this hairy, brown lesion?
Patrick, a 14-year-old budding basketball player, presents complaining of an expanding brown patch on the back of 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 a GP on the Central Coast, NSW, and medical co-editor at Australian Doctor.