如果有保险,也能快速预约到医生,应该看医生.仅凭你这几句描述(无图,有无疼痛?)就能正确诊断的,真是神医.

这是嘴里其中的一种很痛的"溃疡":

Canker sores occur singly or in clusters on the inside surfaces of your cheeks or lips, on or under your tongue,
at the base of your gums, or on your soft palate.
They usually have a white or yellow center and a red border and can be extremely painful.