The purpose of this study was comparing the effectiveness in the topical applications of cyclosporine with that of steroid, the conventional and standard drug in the treatment of oral lichen planus. 21 patients with oral lichen planus were treated with cyclosporine (n=11) or steroid (n=10) by random allocations. They were recalled 2 weeks, 4 weeks, and 8 weeks after initial treatments. In each recall, the lesion size, clinical symptoms like pain or burning sensation, and side effects were evaluated. The differences of these measurements were compared and the effects of each drug were checked. In reticulation types, steroid showed higher effectivity than cyclosporine and this difference was significant statistically. But in erythema type les...