A 16-year-old boy had an asymptomatic, hyperpigmented, hairy lesion on his left upper back. What's your diagnosis?
A 16-year-old boy had an asymptomatic, hyperpigmented, hairy lesion on his left upper back. The pigmentation, first noted 5 years earlier, had progressively spread across his torso. The medical history was uneventful.
What’s your diagnosis?
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