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.