An online doctor may be able to assess a small, familiar mouth ulcer in Singapore when the person is otherwise well, can eat and drink, and can show the sore clearly. The consultation can help with symptom relief and decide whether a dentist, GP or other clinician needs to examine it directly.
An ulcer is a finding, not a complete diagnosis. Repeated or persistent sores, white or red patches, infection and trauma from a sharp tooth may need a closer examination that a phone camera cannot provide.
What a common mouth ulcer looks like
HealthHub describes a typical mouth ulcer as a round or oval sore with a greyish-yellow centre and red border. It can appear inside the cheeks, on the tongue, gums or lips and may sting when eating, talking or brushing. Many settle within one to two weeks.
Possible triggers include accidentally biting the cheek, braces or dentures, stress, hormonal changes and some medicines. Recurrent ulcers can sometimes point to nutritional deficiency or another medical condition. Do not assume that every sore has one simple cause.
A video review may be suitable if the sore is small, short-lived, similar to a previous self-limited episode and not affecting hydration. Take a photo before applying a gel, and tell the doctor where it is and when it first appeared.
Prepare for the call
Use a bright room and a clean spoon or mirror only if you can expose the sore gently. Do not scrape it or force your mouth open. Take one wider image showing its location and one close image if possible. Poor-quality images should not be used to reassure yourself that a persistent lesion is harmless.
Tell the doctor about:
- Number, size and location of sores
- Whether this is a first episode or a familiar recurrence
- Fever, rash, sore throat or swollen glands
- Difficulty drinking, swallowing or opening the mouth
- Recent dental work, braces, dentures or a sharp tooth
- New medicines, including anti-inflammatory medicines
- Smoking or tobacco exposure and any white or red patch that remains
- Whether the sore is improving, unchanged or growing
The online doctor may suggest appropriate pain relief or topical treatment after reviewing your age, allergies, pregnancy status and other medicines. A prescription is not automatic.
Mouth ulcer versus cold sore
HealthHub's National Skin Centre information distinguishes recurrent aphthous ulcers, often on the tongue or inner cheek, from herpes cold sores that may blister and crust around the lip. Cold sores are infectious. The appearance can overlap, especially early in an episode, so avoid kissing, sharing lip products or touching another person's skin if herpes is possible until you have advice.
If multiple painful mouth sores occur with fever or a hand-and-foot rash in a child, hand, foot and mouth disease may be possible. HealthHub advises taking a child with suspected HFMD to a family doctor for assessment rather than relying only on a photograph.
Comfort while the sore heals
HealthHub suggests avoiding spicy, acidic, very hot or hard foods that irritate the ulcer. Gentle oral hygiene with a soft toothbrush remains important. A salt-water rinse may soothe discomfort, but it does not replace evaluation of a persistent lesion. Check with a pharmacist or clinician before using numbing or steroid gels, especially for a child.
Keep drinking. If pain makes fluids difficult to take, do not wait through a routine teleconsult queue; seek direct medical help.
When a clinic or dentist is safer
HealthHub advises seeing a doctor if an ulcer does not improve after seven days of topical treatment, remains unhealed after 14 days without treatment, worsens, recurs often or comes with fever or rash. A sore that is unusually large, hard, bleeds easily, or is accompanied by a persistent white or red patch also deserves a direct mouth examination. A dental cause may require dental treatment rather than medicine.
The camera cannot feel a lump, examine the whole mouth reliably or perform a biopsy. If a clinician refers you for an in-person review, arrange it promptly even if the sore is only mildly painful.
Seek urgent help for severe swelling, difficulty breathing or inability to swallow; call 995 for a medical emergency in Singapore.
For symptoms dominated by throat pain rather than a visible sore, see the cough and sore throat teleconsult guide.
Sources reviewed
- HealthHub: Mouth ulcer
- HealthHub and National Skin Centre: Mouth and lip sores
- HealthHub: Oral cancer and oral lesions
- HealthHub: Hand, foot and mouth disease
- HealthHub: Using telemedicine the safe way
Frequently asked questions
Can an online doctor assess a mouth ulcer in Singapore?
A small, familiar ulcer in an otherwise well adult may be screened by video or clear photos. A doctor may still recommend a dental or medical examination when the view or diagnosis is uncertain.
When should a mouth ulcer be checked in person?
HealthHub advises medical review if it has not healed after 14 days without treatment, has not improved after seven days of topical treatment, is worsening or recurs frequently, or occurs with fever or rash.
Is a mouth ulcer the same as a cold sore?
No. Recurrent aphthous ulcers are usually inside the mouth; herpes cold sores often cause blisters or crusting around the lip and can spread to others. A clinician should assess an unclear lesion.
For a small short-lived ulcer without warning signs, join the OnlineDoctor.sg teleconsult queue.
