The clinical features of cutaneous manifestations in 411 patients with Behçet's syndrome were studied. 302 patients (73.5%) had skin lesions. The frequency with which the following skin lesions were noted was, in decreasing order; erythema nodosum-like lesion, papulopustular eruption, erythema multiforme-like lesion, thrombophlebitis, ulcer and Sweet's syndrome-like lesion. More than two types of skin lesions were seen in 86 patients (28.5%), the combination of the skin lesions being in decreasing order, erythema nodosum-like lesion and papulopustular eruption; erythema multiforme-like lesion and papulopustular lesion; erythema nodosum-like lesion and thrombophlebitis. A skin pathergy test was performed on 245 patients, and a positive reaction was seen in 97 patients (39.6%). This study showed the high incidence, wide spectrum and importance of skin lesions as a major symptom in Behçet's syndrome.