There are no medical professionals here this is a community of patients. For a true second opinion you should consult with a doctor.
That being said I did google geographical tongue as I had never heard of this condition.
I did find:
“What causes geographic tongue? A: The cause of geographic tongue is unknown. Several factors have been proposed as possible causes such as emotional stress, psychological factors, habits, allergies, diabetes and hormonal disturbances. However, none of these factors have been conclusively linked to geographic tongue.”
So it seems that no one knows what causes this condition
However:
“A condition that causes harmless tongue patches resembling smooth, red islands.
Geographic tongue is a harmless condition affecting the surface of the tongue.”
It seems it is a harmless condition.
Further:
“Geographic tongue may indicate a hormonal imbalance, low thyroid, liver disease, yeast overgrowth or a weakened immune system. Poor intestinal health, antibiotic use, liver disease, a bile disorder and digestive disorders (like Celiac, Crohn's, IBS) all impact the color and texture of your tongue.”
So to sum up
The cause is not really known could be many things but it is a harmless condition
Again for a better more informed take on this speak to your medical professional
Best of luck