Nodule With Dark Black Pigmentation: Your Dx?

October 1, 2014

This relatively small (1 cm), pigmented nodule of uncertain duration was noticed on the left arm of a 57-year-old man with a history of skin cancer. What do you suspect here?

This relatively small (1 cm), pigmented nodule of uncertain duration was noticed on the left arm of a 57-year-old man with a history of skin cancer.

What do you suspect here?