The American Society of Dermatopathology

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Interactive Case Study - August 2014

70-year-old man with a scaly erythematous eruption

Peggy Myung, MD, PhD; Christine Ko, MD; Jennifer Madison McNiff, MD

Question 1:

Clinical History:  A 70-year-old man presents with a three-month history of a scaly erythematous eruption most prominently involving his trunk and extremities.  A biopsy from his upper arm (Figures 1-3) and back (Figures 4-5) show the following histopathology.

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Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.


What is the best diagnosis?