A 32-year-old retail worker of Vietnamese descent presents with seven draining fistulae and open comedones in the left axilla and six draining fistulae in the right groin.

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

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