Leukoplakia
This is a white patch on the lining of the mouth that will not rub off or scrape away and cannot be put down to any other known cause.
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This is a white patch on the lining of the mouth that will not rub off or scrape away and cannot be put down to any other known cause. In itself it usually neither hurts nor gets in the way, but it deserves attention: in a small proportion of people such a patch eventually turns into mouth cancer.
The word does not describe a disease with a clear mechanism; it describes what is left after ruling things out. The doctor first satisfies himself that this is not thrush, not the mark of cheek biting and not lichen planus, and only the remainder gets called leukoplakia. The useful question here is therefore not what to put on it, but what it actually is and how it should be watched.
What the patch looks like and what it is not
Typical leukoplakia is a white or greyish-white area with an irregular outline on the inside of the cheek, the tongue, the floor of the mouth, the gums or the palate. It may be flat and smooth or slightly raised, with a wrinkled or cracked surface. There is usually no pain; sometimes it feels rough to the tongue. It appears unnoticed and stays for weeks and months without clearing on its own.
Several features separate it from its look-alikes.
- Thrush (oral candidiasis) — curd-like white plaques that come away on a gauze or a brush, leaving a red, raw surface underneath. Leukoplakia does not come away.
- The mark of cheek biting — a ragged whitish band along the line where the teeth meet, usually on both sides. Drop the habit and within a couple of weeks it evens out.
- Lichen planus — a fine white pattern like lace or netting, generally symmetrical on both cheeks and often stinging with spicy or acidic food.
- Rubbing from a denture or a sharp edge of a tooth — a whitish area exactly where the rubbing occurs. Adjust the denture or smooth the edge and the area goes.
- Soft whitish lining that fades when the cheek is stretched — a harmless variation, not a disease.
There is also a particular variety: multiple plaques with a warty surface that spread and keep coming back. This form behaves more stubbornly than the rest, turns malignant more often, and needs close specialist follow-up rather than a look once a year.
Red is more dangerous than white
Hardly anybody knows this and it is worth knowing. A velvety bright red patch in the mouth that does not heal — erythroplakia — is far less common than a white one but incomparably more dangerous: in most such patches, examination already finds pre-cancerous changes or a cancer that has begun.
The intermediate version is a speckled patch, white mixed with red areas. That one is also more worrying than an even white patch.
The rule is simple: a red or speckled patch lasting more than two or three weeks means seeing a doctor soon, not when there happens to be time.
Why it appears
The exact mechanism is unknown, but the circumstances in which leukoplakia arises far more often are well established.
- Tobacco in any form. Cigarettes, roll-ups, a pipe, and above all chewing and snuff tobacco held in the cheek: there the patch grows precisely where the tobacco sits.
- Betel quid and areca nut, chewing mixtures widespread in South and South-East Asia. Besides patches they cause scarring tightness of the lining, so that the mouth gradually stops opening.
- Alcohol, especially alongside smoking: together the two do more harm than either alone.
- Constant mechanical irritation — a chipped tooth, a poorly seated denture, a habit of biting the cheek.
In a proportion of people, though, none of these applies. Such leukoplakia is called idiopathic, and it is no more harmless than the rest; if anything the opposite, because the factor behind it cannot be removed, so it has to be watched at least as carefully.
Why the patch is always kept under review
Most leukoplakias never become cancer. But a noticeable share of mouth cancers grow out of them, and appearance alone cannot say in advance which patch will be the dangerous one. Surveillance is therefore not over-caution but the only method that works for catching trouble while treatment is still simple and leaves no lasting damage.
The risk is reckoned higher if the patch:
- sits on the floor of the mouth or on the underside or side of the tongue, the least favourable sites;
- is uneven, with red flecks, nodules or a warty surface;
- is large, or there are several;
- has been there for many years;
- has appeared in someone who does not smoke.
The visit should not be put off if the patch has become firm to the touch, has started to bleed or has ulcerated; if there is a sore in the mouth that has not healed in two or three weeks; if a lump or thickening can be felt; if the lip or part of the tongue has gone numb; if a tooth has loosened with no dental reason; if swallowing has become painful or difficult, the voice has changed, or a lump has come up in the neck. None of this is necessarily cancer, but it is checked promptly.
What happens at the appointment
It starts with an examination: the doctor or dentist assesses the patch, feels it and the neck, and asks about smoking, alcohol, chewing mixtures, cheek biting and how long all this has been going on. Often it becomes clear at this stage that a sharp tooth edge or a denture is to blame; that is put right and the mouth is looked at again in two or three weeks to see whether the patch has gone.
If it is still there, a biopsy is arranged: under local anaesthetic a small piece of tissue is taken and studied under the microscope. This is the decisive step, because only this shows whether the cells carry pre-cancerous changes and how marked they are. The biopsy result is what settles the choice between watching and removing.
The procedure is short and the wound heals within days. It is not worth refusing out of fear: the worry of not knowing lasts longer than the biopsy itself, and lost time is expensive here.
What is done about it
No medicine reliably clears leukoplakia. Other things do work.
- Giving up tobacco in every form is the most effective single step. In some people the patch then fades and disappears over a few months; where it stays, the risk of malignant change falls all the same.
- Cutting down alcohol. Recommended limits differ from country to country, but the principle is one: the less the better, and with a patch already present it is wiser to stop altogether.
- Removing the irritant: smoothing a sharp tooth edge, refitting or replacing a denture, treating any accompanying thrush, breaking the cheek-biting habit.
- Regular review with the patch photographed or measured, every few months at first and less often later, as agreed with the doctor.
- Removal by scalpel, laser or freezing, under local anaesthetic and occasionally general. It is used when the biopsy shows marked changes, when the patch lies in a risky spot, or when it is behaving in a worrying way.
One thing about removal is often left unsaid: it does not replace surveillance. The patch frequently regrows in the same place, and lining that has been exposed to tobacco for years stays vulnerable as a whole, so a tumour can arise alongside it too. Reviews carry on after the operation.
Ordinary mouth care helps as well: brushing the teeth and cleaning between them, treating decay, seeing the dentist regularly, eating a varied diet with plenty of fruit and vegetables. None of this cures the patch, but it takes away unnecessary irritation and improves the chance that a change gets noticed in time.
Hairy leukoplakia is a separate story
Despite the similar name this is something quite different. It is caused by the Epstein-Barr virus, the same one behind glandular fever, and it appears only where immune defences are weakened.
It looks like white folded stripes, ribbed or furry in appearance, most often along the sides of the tongue. They are painless, cannot be scraped off and, unlike ordinary leukoplakia, do not turn into cancer.
Something else matters far more: hairy leukoplakia is a signal that the immune system is in trouble. It occurs with HIV infection, including infection not yet diagnosed, after an organ transplant, during treatment that suppresses immunity, and in some blood disorders. Finding it is a reason to be investigated and establish the cause, not to put something on the tongue. The patch itself usually needs no treatment; if it is troublesome, antiviral medicines are prescribed, but the real result comes from restoring the immune defences.
Online consultation
A remote appointment is useful at the stage where it is unclear whom to see and how urgent this is. From a description and a photograph the doctor can suggest whether what you are looking at resembles thrush, a rub mark, or a patch that calls for biopsy, and explain what to ask the dentist and why a vague offer to "keep an eye on it" without examination should not be accepted. The same conversation can make sense of a biopsy report already in hand and set out a plan for stopping tobacco, which in this condition affects the outcome more than any procedure.
Be seen in person and without delay if the patch has hardened, is bleeding or has ulcerated, if there is a sore that will not heal, if the lip or tongue has gone numb, if a tooth has loosened, if swallowing has become difficult, or if a lump has appeared in the neck. Those are examined and biopsied only face to face.
This material is for information only and does not replace medical advice.
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