A healthy 28-year-old woman presents with an asymmetric, 7-mm, dark brown macule on her back. The lesion has been present for many years. She believes that the lesion has grown in size and has become darker in the past few months. There is no personal or family history of skin cancer.
The most likely diagnosis is
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Seborrheic keratosis
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Melanoma
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Acquired melanocytic nevus
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Dysplastic nevus
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Senile lentigo
Answer on page 776
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