porphyria cutanea tarda

An acute porphyria characterized by painful, blistering skin lesions that develop on sun-exposed skin.

Bloom syndrome

A syndrome characterized by sun sensitivity, short stature, predisposition to the development of cancer and genomic instability.

Cockayne syndrome B

A Cockayne syndrome that is characterized by severe physical and mental retardation, microcephaly, progressive neurologic and retinal degeneration, skeletal abnormalities, gait defects, and sun sensitivity with no increased frequency of cancer, and that has_material_basis_in homozygous or compound heterozygous mutation in the gene encoding the group 6 excision repair cross-complementing protein on chromosome 10q11.