[Update in the diagnosis and treatment of actinic keratosis].

Actinic keratosis (AK) is among the most common conditions in dermatology in an increasingly aging population. However, the presence of severe field cancerization with large treatment fields showing multiple lesions with distinct features often poses a therapeutic challenge. The most accurate possible characterization of the treatment field, risk assessment concerning the occurrence of cutaneous squamous cell carcinoma, and knowledge of the efficacy and local side effects of the available interventions are of paramount importance for effective management and preventive efforts. This article summarizes current developments in the diagnosis and treatment of AK and discusses their application in everyday clinical practice. In particular, the focus is on the increasing value of non-invasive diagnostic techniques like "line-field" confocal optical coherence tomography, and the recently approved topical agents tirbanibulin 1% ointment and 5‑fluorouracil 4% cream, as well as current developments of photodynamic therapy and prevention.