Can geographic tongue be caused by allergies?

No: It's a genetically inherited benign condition. Hope this helps.

Geographic tongue: The origin of geographic tongue is uncertain, but there is usually no discomfort or other cause for concern. If there are other symptoms, see your dentist. It is usually just something to live with. Keep your tongue clean by brushing it. I have moderate allergies and don't have geographic tongue while my mother had no allergies and did have geographic tongue.