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Harvard Men's Health Watch

Stay ahead of skin cancer

Learn to spot an actinic keratosis before it becomes cancerous.

Published: September, 2019

About 58 million people have at least one actinic keratosis (AK), a precancerous skin growth caused by too much sun exposure.

Yet most people don't see the potential danger in these lesions because they are small, with few if any annoying symptoms, and can go away almost as fast as they appear.

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