xeroderma pigmentosum

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xeroderma pig·men·to·sum

 (pĭg′mən-tō′səm)
n.
A rare hereditary skin disorder caused by a defect in the enzymes that repair DNA damaged by ultraviolet light.

[New Latin xēroderma pigmentōsum : xēroderma, xeroderma + pigmentōsum, neuter of pigmentōsus, of pigment.]
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Noun1.xeroderma pigmentosum - a rare genetic condition characterized by an eruption of exposed skin occurring in childhood and photosensitivity with severe sunburn; inherited as a recessive autosomal trait in which DNA repair processes are defective so they are more likely to chromosome breaks and cancers when exposed to ultraviolet light
xeroderma, xerodermia - a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin
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A DAD of three who was allergic to light died in a car crash after venturing out at night time.
Kathryn has blogged about her battle for health, which has seen her undergo two bone marrow transplants, a liver transplant and even live in a darkened room for a month when her body became allergic to light.
When she was just eight months old, specialists discovered she was allergic to light.