Phototherapy or light therapy is a form of treatment for skin conditions using artificial light of wavelength same as the ultraviolet part of the sun’s spectrum. In this way, ultraviolet light can be delivered with a higher intensity without the light of all other wave lengths that are present in sunlight, e.g. visible light and infrared. Ultraviolet light reduces inflammation of the skin and can help in various inflammatory skin disorders. During phototherapy, the patient’s skin or just the lesions are exposed to ultraviolet light.