Harvard Men's Health Watch
Stay ahead of skin cancer
Stay ahead of skin cancer Learn to spot an actinic keratosis before it becomes cancerous. About 58 million people have at least one actinic keratosis (AK), a precancerous skin growth caused by too much sun exposure. Yet most people donít 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.