A Pre-market Study to Evaluate the Performance and Safety of a Skin Preparation Device for Removal of Dry Crusty Skin

Inclusion Criteria: * Attending the clinic for treatment of actinic keratosis using daylight photodynamic therapy * Age: 18 - 100 years. * Available for two follow-up visits: two weeks after treatment and 4 months after treatment * Provision of informed consent i.e., subject must be able to understand and sign the patient Information and Consent Form * Subject have been informed on the nature, the scope and the relevance of the study Exclusion Criteria: * Known or suspected allergy/hypersensitivity to phenol formaldehyde * Wound at the skin site to be treated * Documented skin disease at the time of enrollment, as judged by the investigator * Previously enrolled in the present investigation * Inclusion in other ongoing investigations simultaneously that would preclude the subject from participating in this investigation as judged by the investigator * Actinic keratosis treatment obtained within last 6 months * Involvement in the planning and conduct of the clinical investigation (applies to all investigation site staff and third party vendor) * Any subject that according to Medical Research Act, paragraphs 7-10, is deemed unsuitable for study enrolment. * Complications that would increase wound risks if investigational product would be used.