Geographic tongue
Also called: Benign migratory glossitis · Wandering rash of the tongue
Smooth red patches with pale borders that form a map on the tongue and move around over days and weeks. About 2 to 3% of people have it, and it is harmless.
How common
Do you have this?
How it works
The top of the tongue is covered in tiny bumps called papillae. The most numerous are the filiform papillae, thin white-pink threads that give the tongue its rough texture3. In geographic tongue, patches of these papillae are lost. The bare patch looks smooth and red. A white or yellow border of thickened tissue often rings it1. The patches look like islands or countries on a map, which gives the condition its name.
The patches move. One area heals and grows its papillae back while a new patch forms somewhere else. A map that looks one way on Monday can look different by Friday1. Flare-ups come and go for years, and the condition can disappear for long stretches.
The cause is not known. It sometimes runs in families1. It is more common in people with psoriasis, a skin condition, and in people with a fissured tongue, which has deep grooves on its surface12. Some people report that hormones, stress, or certain foods trigger flare-ups. No good studies confirm this.
Most people with geographic tongue have no symptoms. Some notice a burning or stinging feeling from spicy, acidic, or hot foods on the bare patches1.
How common it is
The 2% to 3% figure is the usual estimate for adults1. Some sources report up to 14%1. Estimates vary between populations and age groups, and the condition can go quiet between flare-ups, so an examination during a calm period can miss it. It is more common in people with a fissured tongue and in those with psoriasis12.
Is it a problem?
No. Geographic tongue is a normal variant. It is not an infection and it is not a sign of cancer. It does not spread to other people and it needs no treatment. If the patches sting, avoiding trigger foods during a flare is usually enough.
See a dentist or doctor if a patch on the tongue:
- is painful,
- bleeds,
- stays fixed in one place and does not move.
That is not the pattern of geographic tongue.
History and culture
Because the patches shift, people sometimes photograph their tongue over several days to show a doctor. The changing map is usually enough to confirm the diagnosis on sight1.
Sources and further material
- Wikipedia Geographic tongue
- Wikipedia Fissured tongue
- Wikipedia Lingual papillae
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