A more novel form of treatment involves exposure to broad or narrow-band ultraviolet (UV) light. UV radiation exposure has been found to have a localized immunomodulatory effect on affected tissues and may be used to decrease the severity and frequency of flares.[24][25] In particular, Meduri et al. have suggested that the usage of UVA1 is more effective in treating acute flares, whereas narrow-band UVB is more effective in long-term management scenarios.[26] However, UV radiation has also been implicated in various types of skin cancer, and thus UV treatment is not without risk.[27] Vitamin D has also proven itself an effective treatment for AD.[28]