Peer Reviewed
Dermatology clinic

Pigmented rash localised to the groins

Steven Kossard
Abstract
A man presents with an irritable, pigmented rash confined to his groins and perineal area. What is the cause?
Key Points
    Case history

    Over an eight-month period, a 54-year-old man noted an irritable, pigmented, slightly scaly rash confined to his groins and perineal area (Figure 1). A superficial shave biopsy demonstrated rod-like bacilli forming ‘Chinese letters’ in the stratum corneum (Figure 2).

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