Actinic keratoses are lesions in the outer skin layer caused by too much exposure to the ultraviolet rays of sunshine. They are also the starts of skin cancer, most usually appearing after age 40. A history of burning rather than tanning additionally increases risk. Otherwise dealt with, these bumps can become squamous cell skin cancer. Slideshow: Precancerous Skin Lesions and Skin Cancer Picture SlideshowSlideshow: Sun Damage Pictures Slideshow: Sunburn, Melanoma, Carcinoma, and More Article: Understanding Actinic Keratosis, the BasicsArticle: Understanding Actinic Keratosis, Symptoms Sources: Image: 2007 Interactive Medical Media LLC.
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