Three cases of possible Behcet's syndrome (disease) are presented. One case was a 34 year-old, Korean male, with relatively typical Behcet's syndrome composed by recurrent aphthous oral lesion, hypopyon iritis, and recurrent cutaneous lesion. Other two cases were a 27 year-old, Korean male and a three year-old, Korean girl, with a symptom complex which consists of recurrent oral and cutaneous lesions such as pustules, erosions or ulcerations on the various part of the body surface. All cases were treated by steroids and appropriate antibiotics. The effect of these medications seemed to be evident but not always.