Answer
Lupus Vulgaris, a chronic skin condition caused by tuberculosis bacteria, was successfully treated by Niels Ryberg Finsen. His groundbreaking work in phototherapy revolutionized dermatology, earning him the Nobel Prize in 1903. Finsen's innovative use of concentrated light, particularly ultraviolet radiation, proved effective in combating the infection, leading to improved outcomes for countless individuals afflicted with this debilitating disease.