A 65-Year-Old Man Visits the Office Because He Has Skin

A 65-year-old man visits the office because he has skin lesions on his back. He initially saw the marks five years ago and claims that they are getting increasingly common. The lesions are occasionally itchy, but typically are asymptomatic. The patient had previously declined evaluation because he "didn't care about them," but arranged an appointment today at the demand of his wife. The patient's medical history includes hypertension, hyperlipidemia, and type 2 diabetes mellitus. There are several pigmented plaques on inspection, as illustrated in the photograph below. Which of the following is the most likely diagnosis?

A) Acanthosis nigricans
B) Actinic keratosis
C) Lichen planus
D) Malignant melanoma
E) Psoriasis
F) Seborrheic keratosis

Correct Answer:

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