What is behind this scaly rash?

A 42-year-old woman presents with a pruritic rash over her axillae, face, trunk, back, groin and limbs.

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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 was co-authored by Henry Lee, a medical student at the University of NSW and Dr Anna Wilson, a clinical research fellow at St George Hospital.