Results The most common sit was the palate ( 4/ 9). Few lesions were found in the upper labial mucosa ( 2/ 9). 1 case was found in the buccal mucosa and mandibular retromolar pad and the tongue respectively. 结果9例的发生部位以腭部最多见(4/9),其次为上唇(2/9)、颊、磨牙后垫及舌各1例。