Investigation of the Effect of Lipikar Baume AP+M

Inclusion Criteria: * Male, female, diverse persons (\> 18yo) who are capable of giving consent * Female patients are eligible if the subject is not a woman of childbearing potential (WOCBP) or if she is postmenopausal (cessation of menstruation \>12 months) or surgically sterile (bilateral tubal ligation, bilateral oophorectomy, total hysterectomy) * Signed informed consent * Diagnosis of at least 4 actinic keratoses of the the forearm and/or back of the hand (each arm) * Olsen grade I, II and/or III * Subjects with similar severity and number of AKs on each side symmetrically * The study participant is in good general condition for his or her age and does not currently have any active diseases that, in the opinion of the investigator, justify exclusion from the study Exclusion Criteria: * Known or documented intolerance to any of the ingredients of Lipikar Baume AP+M * Any planned AK treatment during the study * Treatment of actinic keratoses in the application area within the past 3 Months (e.g. photodynamic therapy, topical 5-FU, diclofenac, imiquimod, cryotherapy etc.) * Suspected invasive squamous cell cancer in the application area * Chronic wounds, erosions, pre-existing infected skin or inflammation which, in the opinion of the investigator, are in need of treatment other than the study product * Suspected non-compliance * Current or within the last 8 weeks given systemic cancer medication or systemic treatment with 5-Fluorouracil * Any systemic immunosuppressant …