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    Actinic keratosis

    Solar keratosis; Sun-induced skin changes - keratosis; Keratosis - actinic (solar)

    Actinic keratosis is a small, rough, raised area found on areas of your skin that have often been exposed to the sun for along period of time.

    Some actinic keratoses may develop into a type of skin cancer.

    Causes

    Actinic keratosis is caused byexposure to sunlight.

    You are more likely to develop this if you:

    • Have fair skin, blue or green eyes, or blond or red hair
    • Had a kidney or other transplant
    • Takemedicines that suppress the immune system
    • Spend a lot of time each day in the sun (for example, if you work outdoors)
    • Had many, severe sunburns early in life
    • Are older

    Symptoms

    Actinic keratosis is usually found on the face, scalp, back of the hands, chest, or places that are often in the sun.

    • The skin changes begin asflat and scaly areas. They often have a white or yellow crusty "scale" on top.
    • The growths may be gray, pink, red, or the same color as the skin. Later they may become hard and wart-like or gritty and rough.
    • The areas may be easier to feel than see.

    Exams and Tests

    Your doctor or nurse will look at your skin to diagnose this condition. A skin biopsy may be done to see if it is cancer.

    Treatment

    Some actinic keratoses become squamous cell skin cancer. Have all skin growths looked at by a doctor as soon as you find them. Your doctor will tell you how to treat it.

    Growths may be removed by:

    • Burning (electrical cautery)
    • Scraping away the lesion and using electricity to kill any remaining cells (called curettage and electrodesiccation)
    • Cutting the tumor out and using stitches to place the skin back together (called excision)
    • Freezing (cryotherapy, which freezes and kills the cells)

    If you have many of these skin growths, your doctor may recommend:

    • A laser treatment called photodynamic therapy
    • Chemical peels
    • Skin creams such as 5-fluorouracil (5-FU) and imiquimod

    Outlook (Prognosis)

    A small number of these skin growths turn a type ofskin cancer called squamous cell carcinoma.

    When to Contact a Medical Professional

    Call your health care provider if you see or feel a rough or scaly spot on your skin, or if you notice any other skin changes.

    Prevention

    The best way to lower your risk of actinic keratosis and skin cancer is to learn how to protect your skin from sun and ultraviolet (UV) light.

    Things you can do to lower your exposure to sunlight include:

    • Wear clothing such as hats, long-sleeved shirts, long skirts, or pants.
    • Try to avoid being in the sun during midday, when ultraviolet light is most intense.
    • Use high-quality sunscreens, preferably with a sun protection factor (SPF) rating of at least 15. Pick a sunscreen that blocks both UVA and UVB light.
    • Apply sunscreen before going out into the sun, and reapply often.
    • Use sunscreen year-round, including in the winter.
    • Avoid sun lamps, tanning beds, and tanning salons.

    Other things to know about sun exposure:

    • Sun exposure is stronger in or near surfaces that reflect light, such as water, sand, concrete, and areas painted white.
    • Sun exposure is more intense at the beginning of the summer.
    • Skin burns faster at higher altitudes.

    References

    Habif TP, ed. Clinical Dermatology. 5th ed. Philadelphia, Pa: Mosby Elsevier;2009:pp 812-818.


    Soyer PH, Rigel DS, Wurm E MT: Bolognia JL, Jorizzo JL, Schaffer JV, et al, eds. Dermatology. 3rd ed. Philadelphia, Pa: Mosby Elsevier; 2012:chap 108.



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      A Closer Look

      Review Date: 11/20/2012

      Reviewed By: Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. Review provided by VeriMed Healthcare Network. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, Stephanie Slon, and Nissi Wang.

      The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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