Xeroderma pigmentosum (XP) is a rare condition passed down through families. XP causes the skin and tissue covering the eye to be extremely sensitive to ultraviolet (UV) light. Some people also develop nervous system problems.
XP is an autosomal recessive inherited disorder. This means you must have 2 copies of an abnormal gene in order for the disease or trait to develop. The disorder is inherited from both your mother and father at the same time. The abnormal gene is rare, so the chances of both parents having the gene are very rare. For this reason, it is unlikely for somebody with the condition to pass it on to the next generation, although it is possible.
UV light, such as from sunlight, damages the genetic material (DNA) in skin cells. Normally, the body repairs this damage. But in people with XP, the body does not fix the damage. As a result, the skin gets very thin and patches of varying color (splotchy pigmentation) appear.
Symptoms usually appear by the time a child is 2 years old.
Skin symptoms include:
Eye symptoms include:
Nervous system (neurologic) symptoms, which develop in some children, include:
People with XP need total protection from sunlight. Even the light coming through windows or from fluorescent bulbs can be dangerous.
When out in the sun, protective clothing must be worn.
To protect the skin and eyes from the sunlight:
To prevent skin cancer, the provider may prescribe medicines, such as a retinoid cream, to apply to the skin.
If skin cancer develops, surgery or other methods will be done to remove the cancer.
More information and support for people with XP and their families can be found at:
Over one half of people with this condition die of skin cancer early in adulthood.
Call for an appointment with the provider if you or your child has symptoms of XP.
Experts recommend genetic counseling for people with a family history of XP who wish to have children.
Published Date: April 14, 2021
Published By: Elika Hoss, MD, Senior Associate Consultant, Mayo Clinic, Scottsdale, AZ. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
Bender NR, Chiu YE. Photosensitivity. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 675.
Patterson JW. Disorders of epidermal maturation and keratinization. In: Patterson JW, ed. Weedon's Skin Pathology. 5th ed. Philadelphia, PA: Elsevier; 2021:chap 10.