One in five Americans will develop skin cancer, making it the most common form of cancer in the U.S., according to the Skin Cancer Foundation. But you can protect yourself by regularly checking your skin. In the slides that follow, Dr. Ariel Ostad, a dermatologic surgeon in New York City, explains how to tell benign moles and birthmarks from deadly cancers. But always check with your own doctor.
Here is a picture of lips with actinic keratoses, a common precancer.