A 45-year-old woman with a history of malignant melanoma presents to her family physician with a pruritic, black lesion on her leg. She mentions that she first noticed it after returning from a family picnic 2 days ago. The patient is concerned that it might be malignant and requests a biopsy. Examination reveals an irregular, glossy, black macule above her left ankle.
Which of the following is the most likely cause of this patient’s presentation?
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