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Xeroderma pigmentosa
Definition
Xeroderma pigmentosa is a rare condition passed down through families in which the skin and the tissue covering the eye is extremely sensitive to the ultraviolet part of sunlight.
Causes
Ultraviolet light -- such as that found in sunlight -- damages the genetic material (DNA) in skin cells. Normally, the body repairs this damage. But in persons with xeroderma pigmentosa, 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)
Exams and Tests
The doctor will perform a physical exam and ask if you have a family history of xeroderma pigmentosa.
An eye exam may show:
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 require total protection from sunlight. Even the light coming through window s and fluorescent bulbs is dangerous.
When the person must go in the sun, protective clothing should be worn.
High protection (SPF 30 or greater) sunscreen and very dark, UV-protected glasses should be worn. Your doctor may prescribe medicine to help prevent certain skin cancers.
Support Groups
Xeroderma Pigmentosum Society -- www.xps.org
Outlook (Prognosis)
Most persons with this condition die of skin cancer early in adulthood.
Possible Complications
- Change in appearance of skin (disfigurement)
- Skin cancer
When to Contact a Medical Professional
Call for an appointment with your health care provider if you or your child has symptoms of xeroderma pigmentosa.
Prevention
Experts recommend genetic counseling for persons with a family history of xeroderma pigmentosa who wish to have children.
Abeloff MD, Armitage JO, Niederhuber JE, Kastan MB, McKena WG. Clinical Oncology. 3rd ed. Orlando, Fl: Churchill Livingstone; 2004.
Kumar V, Abbas AK, Fausto N. Robbins and Cotran Pathologic Basis of Disease. 7th ed. St. Louis, Mo: WB Saunders; 2005.
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Typical mistypes for Xeroderma pigmentosa
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