Olivia is a 21-year-old woman who presents to ED with a two-week history of tender widespread annular erythematous plaques with peripheral pustules and scale over her trunk, arms, back and legs.

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Professor Dedee Murrell is head of dermatology at St George Hospital and conjoint professor at the University of NSW.

This article is co-authored by Dr Anna Wilson, a dermatology research fellow at St George Hospital; and Faith Ai Ping Zeng, a medical student at UNSW.