A 19-year-old university student of Asian descent presents with diffuse pruritus, lichenification and erythema over his face, trunk, back, upper and lower limbs.

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

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