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Behcet's disease (BD) is a vasculitis progressing by attacks and remissions. There are actually four nationwide surveys of BD; Iran (5059 patients), Japan (3316 patients), China (1996 patients), and Germany (590 patients). There are four major case series in the world, Turkey (2147 patients), Korea (1155 patients), Morocco (1034 patients), and UK (419 patients). Other series are based on less than 200 patients. MUCOUS MEMBRANE MANIFESTATIONS: Oral aphthosis is seen in 98% of patients (average from the above-mentioned countries). Genital aphthosis occurs less frequently (73%). Skin manifestations are seen in 74% of patients. Behcet's pustulosis (pseudofolliculitis) is seen in 61% of patients in Iran. Erythema nodosum is seen in 22% of patients in Iran. They are more frequent in China and Korea. Ocular manifestations are seen in 51% of patients (anterior uveitis, posterior uveitis retinal vasculitis). Joint …