1, Actinic keratosis (also called solar keratosis, or AK) is a premalignant condition of thick, scaly, or crusty patches of skin.

2, An actinic keratosis, also known as solar keratosis, enlarges slowly and usually causes no signs or symptoms other than a patch or small spot on your skin.

3, You can reduce your risk of actinic keratosis by minimizing your sun exposure and protecting your skin from ultraviolet (UV) rays.

4, It’s not uncommon for 40-something women to develop actinic keratosis—dry, red, flaky spots, often on the forehead, cheeks, or nose, Dr. Goldenberg says.

5, An actinic keratosis (ak-TIN-ik ker-uh-TOE-sis) is a rough, scaly patch on your skin that develops from years of exposure to the sun.

6, An actinic keratosis takes years to develop, usually first appearing in older adults.

7, Many doctors consider an actinic keratosis to be precancerous because it can develop into skin cancer.

8, Photodynamic therapy is a new and developing approach for treating different diseases, such as cancers, age-related macular degeneration, actinic keratosis, rheumatoid arthritis and so on.