It is thought that the incidence of malignant and premalignant skin lesions associated with exposure to the sun, including AKs, has increased by an average of 3% to 8% since the 1960s,[2][9][10][11] although it is likely that this is an underestimate.[12] The proportion of adults with at least one AK lesion is lower (11% to 26%) in temperate northern hemisphere countries (e.g., the US and England), and higher (40% to 60%) in countries closer to the equator (e.g., Australia).[2][13]

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