What Is an Actinic Keratosis? An actinic keratosis is a rough, scaly patch on your skin caused by too much exposure to the ultraviolet rays of the sun or tanning devices. Actinic keratoses (the plural ...

Actinic keratosis is a precancerous growth on the skin that forms due to long-term exposure to UV light. It is also known as solar keratosis. Actinic keratosis growths often appear in groups. The ...