Are there any possible causes/reasons for geographic tongue?

None known: It is really still a mystery why some people develop geographic tongue. There are some suspicions that a vitamin b deficiency may contribute, but still no real answer.

Geographic tongue: is a benign condition affecting the surface of your tongue. It is idiopathic permanent condition and not a cause for bad breath. It may be caused by a lack of vitamin B. It also may be due to irritation from hot or spicy foods, but the fact is the exact cause of geographic tongue is unknown.

Unknown: Geographic tongue also known as benign migratory glossitis,or wandering rash of the tongue has no know cause, however it is benign. The name comes from the map-like appearance of the tongue and is a common condition, affecting approximately 2–3% of the general population. Again it is benign