Is geographic tongue an autoimmune disorder?

Geographic Tongue. The exact cause of geographic tongue is not known. There are some theories about a genetic link as it tends to run in families. As people who have psoriasis also tend to get geographic tongue there is a possibility of an alteration of the immune response, but again, nothing has been proven.
No. No it is not. It has been associated with several disease but it is not considered an autoimmune disorder.
Mystery. Geographic tongue is quite often a mystery that may appear after stress, meds, supplements, nutrition, etc. It is usually no a problem unless pain occurs where some rinses may help.