[Potassium hydroxide 5 % solution in actinic keratosis : A novel therapeutic approach in the lesion-directed treatment].

Background: Actinic keratosis (AK) is an epithelial carcinoma in situ of the skin. There is a need for early treatment due to the risk of malignant transformation. In addition to being effective, the initial therapy in particular should be well tolerated and user-friendly.