Ultraviolet phototherapy of pruritus.
It has been known for more than 2000 years that several skin diseases improve upon exposure to the sun. However, it was not until the end of the 19th century before Niels R. Finsen started to use sunlight as well as electric light for the treatment of skin tuberculosis.1 He was awarded the Nobel Prize in 1903 “in recognition of his contribution to the treatment of diseases, especially lupus vulgar