A discoloured tongue can be caused by issues with your teeth, poor oral hygiene habits and certain substances such as tobacco. Although you should always consult with a dentist, there are instances when specific medical situations can affect your tongue.
- Leukoplakia can cause the cells of the tongue to reproduce at an abnormal rate.
- Scarlet fever is another condition that should be dealt with properly.
- There are times when medications such as antibiotics can play a temporary role.
"A red tongue may be indicative of a vitamin B-12 deficiency or even a folic acid deficiency."
You can learn about some additional causes here: