A woman in her 60s presented with a solitary, indolent, erythematous plaque in the right axilla measuring 5 × 3 cm (Figure, A). She reported a slowly growing subcutaneous node in the right axilla that she had noticed for the first time 10 years ago, and for the past year, she had observed a progressive infiltration of the overlying skin. She also reported having experienced swelling in the right axilla during her pregnancy over 20 years ago that disappeared with lactation. However, since then she had mild episodic pain in her right axilla during her menstrual cycle. A punch biopsy specimen was obtained and histopathological analysis was performed (Figure, B-D).