They occur due to a buildup of food particles, mucus, and bacteria. They may appear as white or sometimes yellow spots on the tonsils. COVID-19 may cause ulcerative lesions in the mouth or throat ...

Matt is the former Head of the Coverage Team at The Motley Fool. He was a full-time Motley Fool employee from 2012-2025 and is a former advisor and analyst for multiple Motley Fool services.