1. Malice festered his spirit.

2. The resentment festered in his mind.

3. These wounds have festered.

4. Resentment festered in her mind.

5. The Koreans' Bitterness had festered for decades

6. The unrequited love festered in her mind.

7. As the weeks wore on, his grief festered.

8. Amelia’s tiny chest festered with a massive infection.

9. Crime, and even sedition, festered in the crowded streets.

10. Since its origins, QAnon has festered in the darker corners of the internet