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 Henry Lee, a medical student at UNSW and Dr Timothy Cowan, a dermatology registrar at St George Hospital.