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Background Actinic keratosis (AK) is a pre-cancerous condition characterised by patches of thick, scaly skin developing on sun-exposed areas of the body. When multiple AKs develop on severely photodam-aged skin, commonly used treatments include photodynamic therapy and diclofenac plus hyaluronic acid gel (DHA). Methyl aminolevulinate daylight photodynamic therapy (MAL DL-PDT) is an alternative to...