What Are Actinic Keratoses? Actinic keratoses (AKs) are a common skin condition characterized by rough, red, scaly patches, crusts, or sores on the top layer of skin (see Figures 1 & 2).

Actinic keratoses are common in older individuals and topical immunotherapy is an important treatment when multiple lesions are present. To assess the efficacy of 5-fluorouracil in treating ...