The American Society of Dermatopathology

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Interactive Case Study - July 2017

19-year-old male with a left leg lesion

Ahmad Charifa, MD; Jennifer McNiff, MD

Question 1:

A 19-year-old male presented with a lesion on the left leg for six months with a clinical impression of keratoacanthoma. An excisional biopsy was performed.
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Figure 1.

Figure 2.

Figure 3.

What is the best diagnosis?