A 17-year-old girl presents with an asymptomatic giant hyperpigmented patch on her left upper back. The lesion was first noted when the patient was 6 months old, and it has gradually increased in size over time. Her past medical history is unremarkable. No similar lesion has been observed in other family members.On examination, there is a sharply circumscribed, light brown hyperpigmented patch on the left upper back. Numerous speckled, dark-brown, hyperpigmented spots are present within the patch. The rest of the examination is unremarkable.
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