Salmon-pink and scaly

Jack, 73, presents with a four-month history of facial erythema, with overlying scale affecting the facial folds, forehead and eyebrows.

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

This article was co-authored by Rachel Xuan, a medical student at the University of NSW and Dr Anes Yang, a dermatology registrar at St George