The American Society of Dermatopathology

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Interactive Case Study - July 2014

Asymptomatic hyperkeratotic papule of the left forearm

Cassondra M. Andreychik, BA; L. David Hall, MD

Question 1:

A 52-year-old man presented with an asymptomatic, 0.5 cm hyperkeratotic papule on the left lower forearm. A shave biopsy was performed (Figures 1-5).

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Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Which of the following is the best diagnosis?