Few lesions were found in the upper labial mucosa (2/9).1 case was found in the buccal mucosa and mandi bular retromolar pad and the tongue respectively.7 cases occurred in males and 2 in females.

• 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。