Case 1

A 45-year-old man presents to your office because a mole on his arm has been changing over the past several months. He has no significant medical history but has been a patient of yours for the past 10 years after his mother was diagnosed with skin cancer. As a teenager, he frequently visited tanning salons and reports numerous severe sunburns. He has fair skin, blue eyes, and many freckles. The mole measured 4 mm in diameter during his last visit. Today it measures 8 mm, is brown and black in color, and has an irregular border.

Can you diagnose the condition in Case 1?

A. Melanoma
B. Reticulated lentigo
C. Seborrheic keratosis
D. Dysplastic nevus

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