Infectious basil stomatitis (rotten mouth)
Infectious stomatitis, often called "rotten mouth", is a common mouth infection in reptiles, including basilisks. \n\nIt affects the gums and oral mucosa. If left untreated, it can spread to the jaw bone and become serious or even fatal. \n...
What is it?
Infectious stomatitis, often called "rotten mouth", is a common mouth infection in reptiles, including basilisks. \n\nIt affects the gums and oral mucosa. If left untreated, it can spread to the jaw bone and become serious or even fatal. \n\nThis disease is often a sign of a general weakening of the animal, linked to poor living conditions (terrarium, temperature, hygiene).
Key point
This disease can become serious and fatal if not treated quickly, particularly in cases of damage to the jaw bone or generalized infection.
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, excess saliva and redness of the gums may be observed. \n\nSmall sores or whitish to yellowish deposits (“cheese” or thick pus appearance) then appear in the mouth. \n\nThe basilisk eats less or refuses to eat altogether, because the mouth is sore. \n\nA bad smell may come from the mouth. \n\nIn advanced cases, the animal becomes very despondent, remains immobile, and may have swelling of the snout or jaw.
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 due to a proliferation of bacteria normally present in the reptile's mouth, which become pathogenic when the animal is weakened or injured. \n\nFungus or viruses can sometimes be associated with or worsen the disease. \n\nA small wound in the mouth (due to prey, an object in the terrarium, or an impact against a window) is often the starting point of infection.
The main risk factors are linked to the environment: terrarium temperature too low or unstable, unsuitable humidity, lack of hygiene, chronic stress. \n\nA weakened immune system, a dietary deficiency (particularly vitamins), or another underlying disease also favor the appearance of stomatitis. \n\nOral wounds, even minimal ones, provide an entry point for bacteria.
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 animal's mouth to assess the extent of the lesions. \n\nSamples can be taken to identify the bacteria or fungi involved. \n\nIn advanced cases, x-rays can be used to check whether the infection has reached the jaw bone.
Treatment
Treatment is based on local cleaning of oral lesions and the use of suitable antiseptics. \n\nAntibiotic treatment, chosen according to the results of the samples, is often necessary. \n\nIn severe cases, nutritional support and correction of living conditions (temperature, hygrometry) accompany medical treatment. \n\nAn intervention to remove affected tissue may be considered if the infection is deep.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Maintaining a temperature and humidity adapted to the species in the terrarium is essential. \n\nRegular cleaning of the habitat limits bacterial proliferation. \n\nA varied and adapted diet strengthens the animal's natural defenses. \n\nAvoiding stress (excessive handling, poorly managed cohabitation) also helps preserve basil's immunity. \n\nRegularly inspecting the animal's mouth helps identify any early signs.
Possible complications
If left untreated, the infection can spread to the jaw bone, causing its gradual destruction. \n\nIt can also spread to the respiratory tract or enter the bloodstream, causing a potentially fatal generalized infection. \n\nProlonged loss of appetite leads to severe weight loss and general weakening.
When to see a veterinarian
Presence of whitish or yellowish deposits in the mouth.
Excessive salivation or unusual drooling.
Refusal to eat for several days.
Visible swelling of the muzzle or jaw.
Marked depression or prolonged immobility.
Prognosis
The prognosis is favorable if the disease is treated early, with correction of living conditions and appropriate treatment. \n\nIt becomes reserved, even dark, in the event of bone damage or generalized infection, situations which require intensive care.
Frequently asked questions
Is basilisk rotten mouth contagious to other reptiles?
It can be transmitted between reptiles if conditions favor the weakening of the immune system, particularly in the case of cohabitation or shared equipment that is not disinfected. It is prudent to isolate an affected animal.
Can we treat basil stomatitis without a veterinarian?
No. Accurate diagnosis and appropriate treatment are necessary, because poorly targeted self-medication can worsen the infection and delay recovery.
What are the first signs to watch for?
Excess saliva, red gums and decreased appetite are often the first visible signs before deposits appear in the mouth.
How to prevent the disease from returning?
Maintaining optimal breeding conditions (temperature, humidity, hygiene, diet) is the best prevention against recurrences.
References
Content reviewed by the TunisieVet editorial team · Updated 27 September 2026
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