A lip that won't heal
John, a 45-year-old farmer, has an intermittently painful lesion on his lower lip in the midline.
Each week, How to Treat publishes a clinical picture quiz.
The quiz has no CPD points attached, it's just for fun.
Take the quiz below, see how you fare against your peers and share your results via social media:
Dr Talacko is an oral medicine specialist and an oral and maxillofacial pathologist in Melbourne, Victoria.