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What is nail melanoma? 21-year-old details spotting skin cancer on nail

When Karolina Jasko spotted a strange spot on her right thumbnail, she wasn’t immediately alarmed. She thought it was just a bruise. It looked like a perfectly straight thin vertical line drawn with a pencil from the top to the bottom of her nail. After the nail became infected, she learned it was acral lentiginous melanoma.
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