Infectious wall lizard stomatitis (rotten mouth)
Infectious stomatitis, also called “rotten mouth”, is an infection of the mouth of the wall lizard. It affects the gums, the inside of the cheeks and sometimes the jaw bone. This is a common problem in weakened or injured captive lizards. W...
What is it?
Infectious stomatitis, also called “rotten mouth”, is an infection of the mouth of the wall lizard. It affects the gums, the inside of the cheeks and sometimes the jaw bone. This is a common problem in weakened or injured captive lizards. Without treatment, the infection can spread and become serious, even life-threatening.
Key point
Without treatment, the infection can spread to the bone and be life-threatening for the animal.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
At first, there is redness of the gums and some thick or foamy saliva around the mouth. The animal may refuse to eat or eat with difficulty, as if it were in pain.\n\nAs it progresses, small whitish or yellowish plaques (caseous pus) appear on the gums or palate. An unpleasant odor may emerge from the mouth. The lizard becomes despondent, remains hidden, and loses weight because it is no longer eating properly.\n\nIn advanced cases, swelling of the snout or jaw may appear, sometimes with teeth moving or falling out. The infection can spread to the underlying bone, making healing more difficult.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
Stomatitis is caused by opportunistic bacteria, that is to say bacteria normally present in the animal's mouth but which become harmful when its defenses weaken. A small wound in the mouth, caused for example by a prey that is too hard or a shock against the decor of the terrarium, opens the door to infection.
Stress is an important factor: a terrarium that is too small, poorly furnished or shared with too many conspecifics favors the appearance of the disease. A temperature or humidity poorly suited to the species also weakens the lizard's natural defenses.\n\nA poor or unbalanced diet, particularly a lack of calcium or vitamins, weakens the tissues of the mouth. A poorly cleaned terrarium, with an accumulation of droppings or decomposing food, increases the number of bacteria in contact with the animal. A pre-existing injury in the mouth, even a small one, provides an easy entry point for infection.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The exotic animal veterinarian examines the lizard's mouth under a magnifying glass or under magnification, because the animal is small. He assesses the extent of the lesions and looks for bone damage. A sample of oral secretions can be taken to identify the bacteria involved and guide treatment. In some cases, an x-ray can be used to check whether the jaw bone is affected.
Treatment
Treatment is based on local cleaning of the lesions by the veterinarian, combined with oral antiseptics suitable for reptiles. Antibiotic treatment, chosen according to the bacteria identified, is often necessary. A correction of breeding conditions (temperature, hygrometry, diet) systematically accompanies medical treatment. In severe cases with bone involvement, a surgical cleaning procedure may be considered by the veterinarian.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Maintaining a clean terrarium, with humidity and temperature suitable for Podarcis muralis, greatly reduces the risk. Providing a varied diet well supplemented with calcium and vitamins strengthens the animal's natural defenses.\n\nIt is advisable to avoid overcrowding the terrarium and to limit sources of stress or injury, such as decorations that are too abrasive or prey that are too large. Regular observation of the lizard's mouth during handling helps identify any problems early.
Possible complications
If left untreated, the infection can spread to the jaw bone, making treatment longer and more difficult. The lizard, no longer able to eat properly, weakens and loses weight significantly. In the most severe cases, the infection can enter the bloodstream and become fatal.
When to see a veterinarian
The animal has refused to eat for several days.\nWhitish or yellowish deposits appear in the mouth.\nAn unusual odor emanates from the mouth.\nSwelling of the muzzle or jaw is visible.\nThe animal remains abnormally depressed or hidden.
Prognosis
The prognosis is favorable if the disease is treated early, before any bone damage. He becomes more reserved when the infection has progressed and affected the jaw bone, requiring longer treatment and sometimes surgery.
Frequently asked questions
Can the wall lizard transmit this disease to humans?
No, this stomatitis is caused by opportunistic bacteria specific to reptiles. It is not contagious to humans.
Can you treat the lizard's mouth yourself with a homemade disinfectant?
No, you should never use an unsuitable product. Only a veterinarian can choose a safe antiseptic for such a small animal and assess the real severity of the lesions.
Can a lizard that has already had stomatitis have it again?
Yes, if the breeding conditions (hygiene, temperature, diet) are not corrected, relapses are possible.
How do I know if my lizard has a sore mouth?
The signs are often discreet: refusal to eat, more abundant saliva, animal remaining hidden. A close examination of the mouth by a cautious adult or veterinarian is recommended if there is the slightest doubt.
References
AVMA — American Veterinary Medical Association
Content reviewed by the TunisieVet editorial team · Updated 28 September 2026
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