This way, small problems do not fester into big ones.

这样小问题就不会扩展为大问题了。

youdao

Now let me dispel a few rumors so they don't fester into facts.

我首先要消除一些谣言，免得误人子弟。

youdao

If ignored, they bother us, affect our health, fester and eventually turn us into the living dead.

如果忽视了，它们打扰我们，影响我们的健康，溃烂，直至最终让我们成为活着的死人。

youdao

Concealed, avoided or otherwise ignored, conflict will likely fester only to grow into resentment, create withdrawal or cause factional infighting within an organization.

FORBES: 5 Keys of Dealing with Workplace Conflict