What's behind these spreading white patches?
Cherie, a 30-year-old woman, presents for review of progressive white patches affecting her skin.
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Professor Dedee 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 Hospital, Sydney.