What Is Mouth Rot in Leopard Geckos?
Mouth rot — also called infectious stomatitis — is a bacterial infection of the gum tissue and mouth lining. While less common in leopard geckos than in some other reptiles, it does occur and can progress quickly if left untreated. Caught early, it's very manageable. Left alone, it can spread to the jawbone and become life-threatening.
Signs of Mouth Rot in Leopard Geckos
- Redness, swelling, or discoloration along the gum line
- Visible mucus, pus, or cottage cheese-like discharge in or around the mouth
- The gecko holding its mouth open or appearing unable to close it fully
- Loss of appetite
- Excessive saliva or bubbling around the mouth
- Swelling of the jaw or face
Quick Rule: Any redness, swelling, or discharge around your leopard gecko's mouth warrants a closer look. Check the mouth during routine handling — early-stage mouth rot is easy to miss.
What Causes Mouth Rot?
- Injury: Bites from live feeder insects, abrasions inside the mouth, or trauma while catching prey can allow bacteria to enter damaged tissue.
- Incorrect temperatures: A gecko kept too cold has a weakened immune response, making infections more likely.
- Poor hygiene: Dirty substrate or infrequent enclosure cleaning increases bacterial load.
- Stress: Chronic stress suppresses immunity and makes geckos vulnerable to opportunistic infections.
Is Mouth Rot an Emergency?
Early-stage mouth rot can be difficult to distinguish from minor mouth irritation. If redness persists, worsens, or is accompanied by swelling, discharge, or appetite loss, schedule an examination with a reptile veterinarian. Early treatment generally leads to the best outcome.
Any visible discharge, pus, or swelling means a vet visit is needed promptly. Do not wait to see if it resolves on its own — bacterial infections in reptiles can escalate quickly.
Treatment
Mouth rot in leopard geckos is treated with antibiotics prescribed by a reptile veterinarian. Do not attempt to treat with over-the-counter products or home remedies — these rarely work and can delay proper care. Your vet may also flush the mouth and debride infected tissue.
- Ensure temperatures are correct — a warm gecko heals faster.
- Keep the enclosure scrupulously clean.
- Ensure fresh water is always available to help maintain hydration during recovery.
- Do not attempt to force-feed.
What Not to Do
- Don't use hydrogen peroxide, Listerine, or other antiseptics in the mouth.
- Don't attempt to remove pus or debris yourself.
- Don't delay a vet visit once discharge is visible.
- Don't house the gecko with others during treatment.
How to Prevent Mouth Rot
- Always feed appropriately sized prey and use feeding tongs to reduce the risk of accidental bites. See our Best Feeding Tongs for Reptiles.
- Remove uneaten feeder insects after feeding, as live crickets can bite resting geckos.
- Maintain correct temperatures at all times — a gecko kept too cold has a weakened immune response.
- Clean the enclosure regularly and remove waste promptly.
- Clean and disinfect water bowls regularly to reduce bacterial buildup.
- Minimize stress — provide adequate hides and avoid sudden environmental changes.
- Inspect your gecko's mouth during routine handling so you catch problems early.
FAQ
Can mouth rot go away on its own?
Minor irritation can resemble early mouth rot, but it's difficult to tell the difference at home. If redness persists, worsens, or is accompanied by swelling, discharge, or appetite loss, your gecko should be examined by a reptile veterinarian.
Is mouth rot contagious to other geckos?
The bacteria involved are opportunistic and can spread through shared equipment or direct contact. Isolate any gecko showing symptoms and disinfect all shared items.
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