Infectious stomatitis in chameleons (mouth rot)
Infectious stomatitis, often called mouth rot, is a bacterial infection of the mouth in common chameleons. It affects the gums and the inside of the jaw. Without treatment, it can spread to the bone and prevent the animal from eating proper...
What is it?
Infectious stomatitis, often called mouth rot, is a bacterial infection of the mouth in common chameleons. It affects the gums and the inside of the jaw. Without treatment, it can spread to the bone and prevent the animal from eating properly. It is a frequent disease in weakened captive reptiles.
Key point
Advanced untreated stomatitis can progress to generalised infection, which may be fatal for the chameleon.
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:
Early signs are often subtle. The chameleon drools more than usual, and the mouth may appear sticky. Whitish or yellowish deposits resembling cheese are sometimes seen on the gums.
Over time, the gums become red, swollen, and may bleed slightly. The mouth develops a foul odor. The animal has difficulty catching or swallowing its food, eats less, loses weight, and becomes listless.
In advanced cases, small abscesses or areas of dead tissue (dark-colored) appear, and the infection can reach the jaw bone.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The disease is caused by opportunistic bacteria—bacteria that are normally present in the mouth but take advantage of the animal's weakened state to multiply. Several bacterial species may be involved, often in combination.
A small injury inside the mouth, for example from prey that is too hard or a collision with tank décor, can also open the door to infection.
The main risk factor is chronic stress from poor husbandry conditions: inappropriate temperature or humidity, insufficient UV lighting, lack of vitamin D3 or calcium, enclosure that is too small or poorly ventilated.
An animal that is already sick, parasitized, or malnourished is more vulnerable. Mouth injuries, sudden environmental changes, and overcrowding in the enclosure also favor the development of the disease.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian examines the chameleon's mouth, looking for deposits, redness or necrotic areas. A swab may be taken to identify the bacteria responsible and choose the most appropriate treatment.
A broader assessment (weight, general condition, checking for nutritional deficiencies or parasites) is often necessary, since this disease is rarely seen in isolation from husbandry problems.
Treatment
Treatment typically combines local cleaning of the lesions with an antiseptic suitable for reptiles and antibiotic therapy, chosen based on culture results if available.
Immediate correction of husbandry conditions (temperature, humidity, UVB, diet) is essential at the same time, otherwise the infection returns. Nutritional support may be needed if the animal is not eating enough.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention relies first and foremost on proper living conditions: temperature, humidity and UVB lighting suited to the species, varied diet well supplemented with calcium and vitamins.
Stress must be avoided, the chameleon's mouth should be checked regularly during handling, and any new chameleon should be isolated before being introduced to others. Regular terrarium cleaning also limits bacterial growth.
Possible complications
Without treatment, infection can reach the jawbone (osteomyelitis), cause tooth or tissue loss, and spread into the bloodstream (septicaemia), which threatens the animal's life. Difficulty eating also leads to severe weight loss.
When to see a veterinarian
Abnormal drooling or sticky-looking mouth
Whitish or yellowish deposits visible in the mouth
Refusal to eat or difficulty catching prey
Bad odour from the mouth
Swelling or redness of the gums
Unexplained weight loss or lethargy
Prognosis
The outlook is good if the disease is caught early and husbandry conditions are improved alongside medical treatment. In advanced cases with bone involvement, the outlook is more guarded.
Frequently asked questions
Is mouth rot contagious between chameleons?
It is not a highly contagious disease like the flu, as it is primarily linked to the animal's weakened condition. However, it is better to isolate a sick animal to avoid any risk and reduce stress on the group.
Can you treat tooth decay yourself with homemade products?
No, you should not attempt to treat this alone. A veterinary diagnosis is necessary to identify the bacteria involved and prevent the infection from worsening or spreading to the bone.
Why did my chameleon develop this disease even though I'm feeding it well?
Diet alone is not enough. Poor UV lighting, inadequate temperature or humidity can weaken the animal's immune system even if it is well fed.
How long does the treatment last?
The duration varies depending on the severity of the lesions and the response to treatment. The veterinarian adjusts the monitoring, sometimes with multiple check-ups to verify complete healing of the mouth.
References
Content reviewed by the TunisieVet editorial team · Updated 01 September 2026
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