White bumps after healing of mouth ulcers are scar tissue formed after healing in normal cases and lesions such as oral leukoplakia or lichen planus in pathological cases, as follows. 1. Normal: Larger ulcers may form scar tissue after healing, which will soften over time and then gradually flatten and disappear. 2. Pathologic conditions: (1) Oral leukoplakia: manifested as white or grayish-white plaques, which may be higher than the mucosal surface, with clear boundaries and soft texture; patients may be asymptomatic or feel localized roughness and wood astringency. (2) lichen planus: manifested as small papules connected to a linear white or grayish-white pattern, the patient may have roughness, wood astringency, burning sensation, when eating spicy and stimulating food, the lesions may have burning sensation. There may be other reasons for white bumps after healing of mouth ulcers, it is recommended to go to the hospital in time.