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    Xeroderma pigmentosum

    Xerodermapigmentosum is a rare condition passed down through families in which the skin and tissue covering the eye are extremely sensitive to ultraviolet light.

    Causes

    Xeroderma pigmentosum is an autosomal recessive disorder. This means you must have two copies of an abnormal gene in order for the disease or trait to develop.

    Ultraviolet light, such asfrom sunlight, damages the genetic material (DNA) in skin cells. Normally, the body repairs this damage. But in persons with xeroderma pigmentosum, the body does not fix the damage. As a result, the skin gets very thin and patches of varying color (splotchy pigmentation) appear.

    The condition also causes spidery blood vessels in the skin (telangiectasia) and skin cancer. Skin cancer often occurs before the child is 5 years old.

    Symptoms

    • Sunburn that does not heal after just a little bit of sun exposure
    • Blistering after just a little bit of sun exposure
    • Spider-like blood vessels under the skin
    • Patches of discolored skin that get worse
    • Crusting of the skin
    • Scaling of the skin
    • Oozing raw skin surface
    • Discomfort when being in bright light (photophobia)
    • Skin cancer

    The doctor will perform a physical exam and ask if you have a family history of xeroderma pigmentosum.

    An eye exam may show:

    • Clouding of the cornea
    • Keratitis
    • Lid tumors
    • Blepharitis

    The following tests can help diagnose the condition in a baby before the birth:

    • Amniocentesis
    • Chorionic villous sampling
    • Culture of amniotic cells

    The following tests can help diagnose the disorder after the birth of the child:

    • Culture of skin fibroblasts
    • Skin biopsy

    Treatment

    Children with this condition need total protection from sunlight. Even the light coming through windows or from fluorescent bulbs is dangerous.

    When these children go out in the sun, they need to wear protective clothing.

    Use high protection (SPF 70 or greater) sunscreen and very dark, UV sunglasses. Your doctor may prescribe medicine to help prevent certain precancerous growths from becoming skin cancers.

    Support Groups

    Xeroderma Pigmentosum Society| www.xps.org

    XP Family Support Group| www.xpfamilysupport.org

    Outlook (Prognosis)

    Most persons with this condition die of skin cancer early in adulthood.

    • Change in appearance of skin (disfigurement)
    • Skin cancer

    Call for an appointment with your health care provider if you or your child has symptoms of xeroderma pigmentosum.

    Prevention

    Experts recommend genetic counseling for persons with a family history of xeroderma pigmentosum who wish to have children.

    References

    Lim HW, Hawk JLM. Photodermatologic disorders. In: Bolognia JL, Jorizzo JL, Schaffer JV, eds. Dermatology. 3rd ed. Philadelphia, Pa: Elsevier Saunders; 2012:chap 87.


    Schadt C, Fine JD. Genetic disorders predisposing to skin malignancy. In: Rigel DS, Robinson JK, Ross M, et al. eds. Cancer of the Skin. 2nd ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 33.

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    • Chromosomes and DNA

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      • Chromosomes and DNA

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      A Closer Look

        Review Date: 5/15/2013

        Reviewed By: Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.

        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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