RT Book, Section A1 Lee, Peter K. A2 Soutor, Carol A2 Hordinsky, Maria K. SR Print(0) ID 1177005687 T1 Actinic Keratosis, Basal, and Squamous Cell Carcinoma T2 Clinical Dermatology YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9780071769150 LK accessmedicine.mhmedical.com/content.aspx?aid=1177005687 RD 2024/04/19 AB Actinic keratoses (AKs) are one of the most common skin findings in dermatology. AKs are benign neoplasms of the epidermis and are considered precursor lesions to nonmelanoma skin cancers. They are very common in sun-exposed areas of the skin, especially in the elderly patient. Ultraviolet light exposure is the main cause of AKs.