They can range in size, being smaller than one millimeter or as big as an inch in diameter.
According toCleveland Clinic, there are two types of canker sores.
Simple canker sores appear around three to four times a year and can go on for about a week.
Ibuprofen and certain fruits and vegetables that have high acidity make them worse (via Cleveland Clinic).
Cankers sores can also show up because of underlying conditions like celiac disease and irritable bowel syndrome.
