Rough, scaly spots of skin that are considered precancerous and are also due to sun visibility. Prevention will be reduce sunlight exposure and use sunscreen. Treatments include doing cryosurgery (freezing with liquid nitrogen), cutting the keratoses away, burning up all of them, putting 5-fluorouracil on them, and making use of photodynamic therapy (inserting in to the bloodstream a chemical that collects in actinic keratoses and means they are much more sensitive to destruction by a specialized as a type of light). Also called solar keratosis and senile keratosis.
an overgrowth of skin levels caused by extended contact with sunlight