Question 1:
A 20-year-old man presented with a three-week history of an asymptomatic 8-mm ulcerated pink papule on the glans penis. A biopsy shows the following histopathology on H&E (Figures 1-3) and immunohistochemical staining (Figure 4).
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Figure 1. H&E, 4x
Figure 2. H&E, 10x
Figure 3. H&E, 20x
Figure 4.
Which of the following is the best diagnosis?