Mouth rot is a bacterial infection of a reptile's mouth, showing as red swollen gums, cheesy discharge and loss of appetite. It follows poor husbandry and needs a reptile vet, not home treatment. Learn the early signs, what to do while you wait, and how to stop it coming back.
Mouth rot (infectious stomatitis) is a bacterial infection of the mouth and gums, seen most in snakes and lizards. Early signs are redness, swelling, loss of appetite and a reluctance to close the mouth; later you may see cheesy yellow-white material, drooling or bleeding gums. It needs a reptile-experienced vet: home treatment alone rarely cures it and the infection can spread to the jaw bone or lungs.
Mouth rot is a bacterial infection of a reptile's mouth, showing as red swollen gums, cheesy discharge and loss of appetite.
Stomatitis develops in stages, so early detection matters. First signs are subtle: your reptile may go off food, paw at its mouth, or hold the mouth slightly open. Look for redness or swelling along the gum line, small pinpoint bleeding spots (petechiae), and thick, yellow or cream cheese-like discharge between the teeth or in the mouth corners. Advanced cases show drooling, a swollen jaw, foul smell, loose teeth and visible pus.
Early mouth rot is subtle: redness, swelling and reluctance to close the mouth.
Mouth rot is usually opportunistic: normal mouth bacteria overwhelm tissue that has been weakened. The underlying triggers are almost always husbandry-related, temperatures that are too low for a healthy immune system, incorrect humidity, chronic stress, poor diet or vitamin imbalance, or a small mouth injury from live prey, cage furniture or repeated striking at the glass. Correcting these root causes is essential, or the infection returns even after treatment.
Do not try to scrape or pick at the mouth, and do not dose leftover medicines. Book a reptile vet promptly, ideally within a day or two, because early stomatitis is far easier to treat than an advanced case. While you wait, optimise husbandry: confirm the warm-end temperature and overall thermal gradient, correct humidity for your species, and reduce stress and handling. Offer water, and note any changes in appetite or drooling to report.
Mouth rot needs a vet to clean the tissue and choose the right antibiotic.
Your vet will examine the mouth, often clean and debride the infected tissue, and may take a swab to identify the bacteria so the right antibiotic is chosen. Treatment usually combines a topical antiseptic or antibiotic applied to the mouth with systemic antibiotics, plus pain relief and sometimes assisted feeding if your reptile has not been eating. Severe cases with jaw-bone involvement may need imaging and longer, more intensive care. Follow the full course and re-check as advised.
Can I treat mouth rot at home with an antiseptic?
Mild cleaning may be part of a vet-directed plan, but home treatment alone usually fails because the infection needs proper debridement and often systemic antibiotics. See a vet first.
Is mouth rot contagious to my other reptiles?
The bacteria are often environmental, but stress and shared husbandry problems mean housemates can be at risk too. Review the whole setup and monitor everyone.
Why does my reptile keep getting mouth rot?
Recurrence almost always points to an unresolved husbandry issue, low temperatures, wrong humidity, poor diet or ongoing stress. Fix the root cause, not just the symptom.
My reptile is drooling, is it always mouth rot?
Not always. Drooling can also accompany respiratory infections or overheating. Pair it with a mouth check and other signs, and let your vet make the diagnosis.
This article is for general education and is not a substitute for professional veterinary advice. If your pet is unwell, please consult a veterinarian.
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