Mediterranean basin, corresponding to the Old Silk Road, an ancient trading route stretching between the Mediterranean, the Middle East, and the Far East 3 with an estimated prevalence of 13.5-20 cases per 100,000 people in Japan, Korea, China, Iran, and Saudi Arabia. 2 In Japan, the estimated prevalence of BD was reported as 14.9 per 100,000 people in 2002. 4 According to the diagnostic criteria published by the Japanese Ministry of Health, Labour and Welfare, 5,6 the major symptoms of BD include recurrent oral and genital ulceration, skin lesions such as erythema nodosum, subcutaneous thrombophlebitis, pseudofolliculitis and acneiform nodules, and ocular