Actinic keratoses are cell changes in the epidermis that can develop into skin cancer. They are seen as slightly red and rough dry spots of a few millimeters to a couple of centimeters in size. In most people, they do not cause problems beyond the fact that there are visible spots.
Actinic keratoses appear in places that are exposed to a lot of sun throughout life, typically the face, the backs of the hands and the forehead of men with little hair.
Actinic keratoses are treated by a dermatologist either with freezing (liquid nitrogen), creams (imiquimod, fluorouracil) or photodynamic therapy (PDT).