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Actinic keratosis (AK) is a frequent premalignant skin lesion mainly caused by chronic sun exposure. AK lesions are often surrounded by invisible, subclinical alterations, called field of cancerization (FoC). Definition of FoC is of importance for therapy management; however, the criteria and non‐invasive tools to characterize FoC are lacking. Atomic force microscopy (AFM) proved to be a suitable...