MSFinals-6499

A 67-year-old woman comes in with a lesion on her left breast. Upon examination, there is a weeping, crusting lesion on the left nipple, but the areolar region is unaffected. No palpable mass is found in the breast, but there is a palpable lymph node in the axillary region. The patient’s doctor attempted to treat the lesion with 1% hydrocortisone cream, but it was unsuccessful. What is the probable diagnosis?