This study suggested that the pain display, local congestion, macule, the enlargement of the lesion proliferation, ulceration and firm of the mass were all the bodements of malignancy change.

• 白斑出现疼痛，局部充血红斑，损害迅速扩大、糜烂、增殖质硬等，都可能为恶变的徵兆。