THE MERCK MANUAL: The Merck Manual of Diagnosis and Therapymultimedia

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  • Chronic Effects of Sunlight
  • Actinic Keratosis

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    Actinic Keratosis

    Actinic keratoses are premalignant lesions that are a consequence of many years of sun exposure. Actinic keratoses should not be confused in name or appearance with seborrheic keratoses, which also develop with age but may occur on non‒sun-exposed areas and are not premalignant.

    Image provided by Thomas Habif, MD.