It may also lead to biting the inside of your mouth, and cause a canker sore. You might have a weak immune system due to chronic illnesses or due to anti-cancer medications. According to a study ...

Canker sores can develop anywhere on the tongue ... In this case, taking vitamin B2 targets the underlying cause. Medication ...

or they can be a sign of a serious condition that may require treatment. If minor canker sores are the cause of your white spots, they should clear up on their own in one to three weeks.