A brown macule on the arm and face

Case #1

A 52-year-old man presents with a lesion on his left arm. He decided to come into the office because he wife asked him to "have the spot checked out." On examination, the lesion is a 1.2 × 0.8-cm irregularly pigmented, asymmetric brown macule, with color variegation and irregular borders. The patient says the lesion itches a little bit, ...