A red-faced patient

A 74-year-old Caucasian woman presents with a reddish-purple rash across her face, neck, shoulders and chest.

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

This article was co-authored by Katharina Sies, a medical student at the Albert Ludwigs University, Freiburg, Germany, and Dr Charlotte Gollins, a clinical research fellow, at St George Hospital.