A 29-year-old female of Chinese descent presents to the dermatologist with a three-month history of an itchy antecubital rash bilaterally. 

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<p>A 29-year-old female of Chinese descent presents to the dermatologist with a three-month history of an itchy antecubital rash bilaterally.</p><p>Following the COVID-19 pandemic, she had begun washing her wool jumpers using an antifungal and antibacterial laundry product.</p><p>Her GP had prescribed oral prednisolone 25mg for four days, topical corticosteroids twice daily and moisturiser. The rash persisted despite these treatments.</p><p>She has a previous history remarkable only for urticaria in childhood. She has no known allergies. There is no family history of skin disease.&nbsp;She lives alone with no pets.</p><p>On clinical examination, there is a red-brown, scaly, symmetrical rash in her cubital fossae bilaterally.&nbsp;</p>

Professor Dedee Murrell is head of dermatology at St George Hospital, Sydney, and conjoint professor at UNSW Sydney.