RESUMEN
Objective To evaluate the effectiveness of UV-B radiat io n exclusively on a variety type of leukoderma .Methods In open trail, 45 cases of a variety of leukoderma were randomly selected including preg nant striates (20 cases), stretch marks (1 case), postoperative petechia (4 case s), traumatic petechia (10 cases), radiation petechia (2 cases), generalized vit iligo (6 cases) and leukoderma with unknown cause (2 cases) were treated with Re lume UV-B re-pigmentation generator (photo range 290-320 mm), once per week with an adjusting dose for 3-20 treatments. Results 42 cases c ompleted with followed-up after 14 months of UV-B radiation microphototherapy. 64.3% (27 cases) achieved excellent results, including 10 cases of pregnant str iates, 8 cases of traumatic petechia, 4 cases of postoperative petechia and 5 c ases of peneralized vitiligo. 28.6% patients were satisfied with results (12 ca ses), including 7 cases of pregnant striates, 1 case of traumatic petechia, 1 c ase of generalized vitiligo, 1 case of stretch mark and 2 cases of leukoderma wi th unknown causes. 7.1% (3 cases) had no effect. 33.3% (14 cases) required suppl emental treatment after 2-5 months of the initial therapy. Conclusion The UV-B radiation microphototherapy is effective in restoring pigmenta tion in those affected by a variety of leukoderma except radiation petechia. The result of repigmentation is related to the type of leukoderma.