http://www.aad.org/public/exams/screenings/faqs_skin_cancer.html
American Academy of Dermatology
This page provides answers to frequently asked questions about actinic keratoses (AKs) and skin cancer. AKs are a common skin condition characterized by rough, red, scaly patches, crusts or sores on the top layer of skin. The page includes information on who gets AKs, what causes AKs, where AKs are usually found, how AKs are treated, where someone can get more information about AKs and skin cancer, and more.