You’ll see ultraviolet lamps in many areas of hospitals and medical centers used in a variety of ways. Doctors began to appreciate the healing powers of ultraviolet light as far back as the early years of the 20th century. In 1903, Dr. Niels Finsen won the Nobel Prize in Medicine for curing lupus of the skin with ultraviolet violet. To this day, dermatologists rely on external UV for psoriasis and certain skin cancers. But sterilizing medical equipment, or treating psoriasis, use UV externally.