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Diagnosis: Geographic Tongue (Benign Migratory Glossitis)
The image shows a classic presentation: a well-demarcated, erythematous (red), smooth depapillated patch on the dorsal surface of the tongue, with a characteristic map-like appearance. This is encircled in red in the photo.
Other Names
- Benign Migratory Glossitis
- Glossitis Areata Migrans
- Oral Erythema Migrans
- Stomatitis Areata Migrans
What It Is
Geographic tongue is a benign, idiopathic inflammatory condition characterized by focal loss of filiform papillae on the dorsal tongue. The lesions form smooth, red, slightly atrophic patches with peripheral erythema and a yellowish-white serpiginous (map-like) border - hence the name "geographic."
Key features (Dermatology 5th Ed.):
- Red, well-demarcated patches on the lateral and dorsal tongue
- Scalloped, thin white borders
- Psoriasiform mucositis of unknown etiology
- Characteristically migratory - lesions wax and wane, appear/disappear in different areas day to day
- Affects 1-3% of the general population, no sex predilection
Pathophysiology
Histologically, it is considered a "psoriasiform mucositis" because it shares features with psoriasis:
- Loss of papillary surface morphology
- Elongation of rete ridges
- Focal parakeratosis, spongiosis
- Superficial intraepithelial neutrophilic microabscesses (spongiform pustules)
Some patients with geographic tongue have been found to carry mutations in IL36RN, a causative gene for generalized pustular psoriasis.
Associations
| Association | Notes |
|---|
| Atopy / allergies | Common |
| Psoriasis | Increased prevalence in psoriatic patients |
| Fissured tongue | Co-occurs in up to 1/3 of cases |
| Reactive arthritis (Reiter syndrome) | When lesions occur with arthritis, called "annulus migrans" |
| AIDS | Reported as an acquired association |
| Lithium therapy | Drug-induced reports exist |
Symptoms
- Usually asymptomatic - most patients are unaware
- Can cause burning sensation or sensitivity to hot/spicy foods
- Periods of exacerbation and remission
Management
| Situation | Management |
|---|
| Asymptomatic | No treatment needed. Reassure the patient it is entirely benign - this is the most important step |
| Mild symptoms (burning) | Viscous lidocaine or diphenhydramine rinse for symptomatic relief |
| Sensitivity to spicy/acidic foods | Avoid trigger foods |
| Severe/persistent symptoms | Topical corticosteroids (e.g., triamcinolone acetonide in orabase) |
| Refractory cases | Topical tacrolimus 0.1% ointment (shown to produce clearing; BMJ Case Rep 2014) |
| Failed all above | 0.1% tretinoin topically - reported to clear lesions within 4-6 days |
The most important management step in a 23-year-old woman is reassurance - she should be clearly told this is a completely benign condition, not contagious, not a sign of cancer, and does not require biopsy in a typical presentation.
Differential Diagnosis to Consider
- Oral candidiasis - white patches that can be wiped off; geographic tongue patches are red/smooth
- Leukoplakia - fixed white patches; should be biopsied if uncertain
- Erythroplakia - persistent red patch; higher malignant potential, needs biopsy
- Lichen planus - usually has Wickham's striae, buccal involvement
Sources: Andrews' Diseases of the Skin (Clinical Dermatology), Dermatology 2-Volume Set 5e, Fitzpatrick's Dermatology