Actinic keratoses are lesions on the outer skin layer caused by
too much exposure to the ultraviolet rays of sunlight. They are also the
beginnings of skin cancer,
most often appearing after age 40. In some areas where climate is mild
year-round -- like Florida and California -- these lesions appear in much
younger people, even teenagers.
People with fair skin, blond or
red hair, and blue or green eyes are most at risk of developing these rough,
scaly "bumps." A history of burning rather than tanning also increases risk. If
not treated, these bumps can develop into a more serious form of skin cancer.
Read more about actinic keratosis.