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A 69-year-old man presented with a 12-month history of unilateral eczematous changes of the left nipple and areola without any signs of systemic inflammation. His main complaints were mild, intermittent itching, and occasionally local pain or burning. An external initial treatment with topical corticosteroids combined with disinfectants/antibiotics did not lead to an improvement. Triggering factors or any other conditions that could affect the diagnosis could not be detected. Histopathological examination of a biopsy from the left nipple performed at admiss