Abstract: Behcet's disease (BD) is not ran in Iran. The annual incidence is around 345 patients for a population of 60 millions. The male/female ratio is 1. 13. The mean age at the onset of the disease is 26.2+9.7 years (CI at 95%=0 .4). The prevalence of clinical signs were as follow: Mucous membrane lesions 96%+0.7 (oral aphthosis 95.7%, genital aphthosis 64%); skin lesions 74%±I.5 (pseudofolliculitis 66%, erythema nodosum 23%): ocular ...