Her Mouth Burned Every Time She Ate Anything With Tomato In It

Quick answer: Oral lichen planus is a long-term inflammatory condition of the mouth lining. It is not an infection, it is not contagious, and it is not caused by anything you did. It is managed rather than cured, most people control it well, and it needs periodic review because a small number of cases can change over many years.

The call

She had been to her family doctor twice and had been given an antifungal both times. It had not helped either time, which is itself diagnostic information.

Tzippy, 54, from Nofei Aviv, described a burning soreness in both cheeks and along her gums, worse with anything acidic or spicy, present most days for around eight months. Some days were fine. Some weeks were miserable.

What we found

The appearance is often characteristic once you know what you are looking at.

Both cheeks showed a fine network of white lines — a lacy pattern, symmetrical across the buccal mucosa. Symmetry is the key observation: most things that matter in the mouth are one-sided, while lichen planus is typically bilateral and roughly mirror-image.

Two areas were different. On the left cheek there was a shallow eroded area about 10mm across, red and raw-looking, and the gums around three lower front teeth were bright red and smooth, a pattern called desquamative gingivitis. Those areas were the source of the burning.

The lacy white lines themselves caused her nothing at all.

On her tongue the pattern was fainter and her lips were unaffected. Her skin was clear, with no rash on the wrists, shins or lower back, where the skin form of the condition often shows.

What was ruled out or considered:

• Thrush. The pattern did not rub off and two courses of antifungal had done nothing — though candida can sit on top of lichen planus and confuse the picture.
• A reaction to a filling. A lesion sitting directly against an amalgam and matching its outline is a lichenoid contact reaction, and replacing the restoration can resolve it. Hers matched no restoration.
• A drug reaction. Several common medications can produce one, and her list was reviewed with that in mind.
• Autoimmune blistering conditions, which look similar on the gums and are managed differently.

A biopsy was taken, because the erosive form warrants histological confirmation rather than a confident look. It confirmed lichen planus.

Her blood pressure medication had been started around ten months before the symptoms, which is close enough to be worth noting. Her doctor was written to. After discussion the medication was changed, and while her symptoms improved somewhat, the condition did not resolve — which is common, and does not mean the enquiry was wasted.

What we did

Explained what it is, which took most of the first appointment. Not an infection, not contagious, not caused by diet, stress or poor hygiene — though stress often makes it flare. Not curable, and usually controllable.

That conversation matters more than any prescription. People who understand a long-term condition manage it; people who expect a cure stop treatment when it does not arrive.

Topical steroid for the erosive areas — a steroid mouthwash used as a rinse, and an adhesive paste for the specific ulcerated patch, prescribed in consultation with her doctor. Symptoms settled substantially within three weeks.

Trigger management, which she worked out herself over a couple of months by keeping a note:

• Tomato, citrus and vinegar were reliable triggers.
• Spicy food, particularly chilli.
• Strongly flavoured toothpaste. She changed to one without sodium lauryl sulphate and without a strong mint, which helped noticeably.
• Alcohol-containing mouthwashes, which she stopped.
• Crisps and anything with sharp edges, during a flare.

Meticulous gum care, because plaque makes desquamative gingivitis considerably worse. A soft brush, careful technique, and three-monthly hygienist appointments — which improved her gum symptoms more than anything else did.

Candida watch. Topical steroids in the mouth predispose to thrush, so she was told what it looks like and to report it. It happened once, in year two, and was treated straightforwardly.

Long-term review, six-monthly, with photographs. The reason was explained plainly rather than left implicit: a small proportion of oral lichen planus cases — particularly the erosive form — can undergo malignant change over many years. The figure quoted in the literature is low, generally around one per cent over a decade, and the estimates vary. Monitoring is not alarm; it is the reason not to be alarmed.

The outcome

Three years on, she has flares two or three times a year, usually around periods of stress or illness, and manages them with the steroid rinse she keeps at home.

The erosive area on the left cheek healed and has not returned in the same place. The lacy white lines are unchanged and always will be.

She eats normally except for tomato, which she has given up and does not miss as much as she expected.

What to do if this happens to you

1. A sore mouth not responding to antifungal treatment needs a different diagnosis, not a third course.
2. Note what triggers it. Most people find two or three specific foods account for most flares.
3. Change to a mild toothpaste without sodium lauryl sulphate and without strong mint.
4. Keep the gums scrupulously clean. Plaque makes the gum form significantly worse.
5. Use topical steroids as directed and report any white curd-like coating, which suggests thrush.
6. Keep the review appointments, indefinitely. This is a condition that is watched rather than discharged.

A sore mouth that has not settled? Book a soft tissue assessment at Ramat Beit Shemesh Urgent Dental Care. 055-985-8845 · WhatsApp https://wa.me/972559858845 · Harav Kook 28/1, Beit Shemesh

This is a composite clinical story. It reflects a presentation we see regularly in Beit Shemesh and Ramat Beit Shemesh; the name and details are illustrative and are not those of a real patient.