A 60-year-old laboratory technician complained of a pruritic rash on and around her left ear. It had appeared a few days earlier, shortly after she cleaned her telephone receiver with a disinfectant. A tentative diagnosis of contact dermatitis was made, and treatment with a hydrocortisone cream was initiated.
The patient returned a week later, at which time this photograph was taken. There had been no change in the appearance of the rash.
What other cause might you consider?
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