Oral Mucosal Ulcers Management
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Direct answer
Every oral ulcer earns the same two questions: how long has it been present, and what is the likely cause? Any ulcer that has persisted beyond three weeks, or any ulcer with induration, everted margins or unexplained cervical nodes, is investigated as possible malignancy — the three-week rule is the safety net of oral medicine. The commonest ulcers, recurrent aphthous stomatitis (RAS), are managed on severity: chlorhexidine mouthwash and topical corticosteroid such as triamcinolone acetonide 0.1 per cent for minor ulcers, with systemic steroids, colchicine or thalidomide reserved for major disease and Behçet's syndrome under specialist care.
What you must remember
- The three-week rule: an ulcer unhealed after three weeks, or any unexplained persistent ulceration, is referred for biopsy — no topical treatment trial beyond that window.
- Recurrent aphthous stomatitis types: minor (about 80 per cent — under 1 cm, anterior non-keratinised mucosa, heals in 10–14 days, does not scar); major (over 1 cm, lasts weeks to months, scars — Sutton's disease); herpetiform (crops of 1–3 mm ulcers, heals without scarring).
- Malignant ulcer features: everted or rolled margins, indurated base, fixation, unresponsiveness, associated neck nodes; induration extends beyond the visible edge.
- First-line RAS therapy: 0.2 per cent chlorhexidine mouthwash, topical corticosteroid (triamcinolone acetonide 0.1 per cent in Orabase, or betamethasone rinse) applied at the prodromal or early stage.
- Second-line options: tetracycline mouthwash (capsule contents in water; avoided in children), sucralfate suspension, amlexanox 5 per cent paste; systemic steroids, colchicine or thalidomide for major/refractory disease.
- Screen a proportion of RAS patients for haemoglobin, ferritin, folate and B12; consider coeliac disease, Behçet's syndrome (oral plus genital ulcers and ocular inflammation) and HIV in atypical presentations.
- Traumatic ulcer: identify and remove the cause (sharp tooth, denture flange, habitual bite), then re-examine within two weeks — persistence after cause removal mandates biopsy.
- Special ulcers to name on demand: tuberculosis (undermined margins, caseating granulomas on histology), syphilitic chancre and gumma, and ulceration overlying necrotic tumour.
Working through an ulcer step by step
A 45-year-old man has a 2 cm ulcer on the right buccal mucosa for six weeks; he uses gutka and smokes bidis. Walk the pathway. Step one: history — duration beyond three weeks, progressive, interfering with chewing, referred ear pain. The three-week rule is already breached, so this ulcer is a biopsy until proven otherwise.
Step two: examination — margins (everted at one pole), base (stony induration extending beyond the visible edge), level IB and level II nodes (a 1.5 cm firm right submandibular node), measurements recorded. Step three: incisional biopsy from the margin including normal mucosa, deep enough for the pathologist to judge invasion; an OPG assesses bone. Step four: histopathology reports a well-differentiated squamous cell carcinoma, and the patient is referred to head and neck oncology for staging and treatment.
Now contrast the other classic: a 22-year-old woman with recurrent 4–5 mm ulcers on the labial mucosa, three to four episodes a year, each healing within ten days since her teens. This is minor RAS: trigger review (stress, menstrual cycle, minor trauma), chlorhexidine mouthwash, topical triamcinolone applied at the prodromal tingle, and haematinic screening if deficiency is suspected. Same symptom — ulcer — but two different diseases on two different pathways, separated by duration, character and risk factors.
How the exam frames it
One-liner framing dominates: "which recurrent oral ulcer scars?" — major RAS (Sutton's disease); "which ulcer has undermined margins?" — tuberculosis; "ulcer with pseudomembrane and a history of gutka for 12 quid-years?" — carcinoma until biopsied. The trap students fall into is treating a chronic ulcer with an anaesthetic gel and reviewing "in a month": the three-week rule exists precisely because the aphthous and traumatic ulcers heal inside two to three weeks, and the ones that do not are the dangerous ones. A second trap is herpetiform RAS mislabelled as herpes simplex: herpetiform RAS occurs in crops on non-keratinised mucosa in adults without a vesicle stage, lacks fever and lymphadenopathy, and recurs in the same pattern; herpetic lesions begin as vesicles on keratinised mucosa in a primary infection with systemic features.
Frequently asked questions
What is the three-week rule in oral ulceration?
Any oral ulcer that has not healed within three weeks, whatever its apparent cause, requires biopsy or urgent specialist referral, because persistent ulceration is a presenting feature of oral carcinoma.
How are the three types of recurrent aphthous stomatitis distinguished?
Minor: under 1 cm, heal in 10–14 days without scarring, commonest; major: over 1 cm, last many weeks and scar; herpetiform: recurrent crops of tiny 1–3 mm ulcers on non-keratinised mucosa.
What is the drug of first choice for painful minor aphthous ulcers?
Topical corticosteroid such as triamcinolone acetonide 0.1 per cent applied early in the episode, with 0.2 per cent chlorhexidine mouthwash; sucralfate or amlexanox are alternatives.
When are systemic drugs used for aphthous ulceration?
For major ulcers, frequent severe recurrence, Behçet's syndrome or disease refractory to topical therapy — systemic corticosteroids, colchicine, or thalidomide under specialist supervision.