Geographic tongue also called Erythema Migrans is a common benign condition. It effects females more than males. It occurs on the tongue as well as palate and other surfaces in the mouth. It is harmless condition and incurable. The cause is unknown. Some patients experience some burning or tingling to spicy or hot foods.
I also have geographic tongue. As a dentist myself, I don't do anything to treat it. When it flares up, I avoid spicy food.
I wouldn't worry about it. It's harmless, although uncomfortable.
There is a good chance that you have activated a trigger point in your digastric muscle.
It's helpful to understand the anatomy & physiology of your tongue - the muscles in the front of your neck, the digastric, suprahyoid & infrahyoid, and the anterior vertebral muscles and the nerves that supply them.
When you have a clear understanding of the function of these muscles you will be able to reproduce the pain at will and you will know what to do so as not to aggravate your condition.
Studying the function of the hyoid bone is a good place to start.
Symptoms - depending on the muscle and the location of the trigger points - are a painful burning tongue (glossodynia), dry mouth, sores on the tongue, difficulty talking, a sore throat with no inflammation, pain on swallowing and the feeling that there is a something/lump stuck in the throat, and pain in the lower back teeth. Your voice may be hoarse.
All these muscles function to open your mouth. Some also assist in flexing your head and spine, rotating your neck laterally and tilting your head to the same side. They also act as stabilizers. The mylohyoid muscles are used to chew, suck and blow.
Whiplash can activate these trigger points. Mouth-breathing, forward head posture, bruxism and a malocclusion will aggravate them, as can heat, cold, and spices.
Correcting your posturing from an excessive forward head position and breathing through your nose - not the mouth - are necessary for long term relief.