What are the physical symptoms of the disease?

The areas exposed to the sun will turn red and have heavy freckling and scaly skin. They may also have random dark spots on these areas. Then their skin will become mottled, with the blood vessels showing through their skin. After that, they will most likely develop different kinds of skin cancer. They may also have eye issues, such as being sensitive to the sun and being easily irritated. They may also suffer some type of mental retardation.