A biopsy is the process of examining a small tissue sample under a microscope. It is one of the methods doctors may use when a lesion needs to be evaluated for cancer or another specific condition.

The important message is simple:

Don't try to diagnose a persistent mouth lesion yourself. Get it examined.

Chapter 5: Don't Ignore Changes—But Don't Assume the Worst

Seeing an unusual spot, lump, ulcer, or patch inside your mouth can be frightening, especially after reading about serious diseases online.

But there is an important distinction between recognizing a warning sign and assuming a diagnosis.

Most mouth sores and oral abnormalities are not cancer.

People develop mouth ulcers, gum inflammation, infections, irritation from dental appliances, and other harmless conditions all the time. Even symptoms that can occur with oral cancer are often caused by something else.

What makes a symptom worth checking is generally its persistence, unexplained nature, progression, or combination with other changes.

Pay particular attention to a mouth sore that does not heal, a persistent red or white patch, an unexplained lump or thickened area, repeated bleeding, ongoing pain, unexplained numbness, difficulty chewing or swallowing, or a persistent change in the way your mouth or throat feels.

People who smoke or use other tobacco products should be particularly attentive to oral changes because tobacco exposure is an established risk factor for oral cancer. Excessive alcohol consumption also increases risk, and the combination of tobacco and heavy alcohol use can increase risk further.

Good oral hygiene and regular dental care are important, but they cannot guarantee that every serious condition will be prevented.

Regular dental examinations can provide an opportunity for a professional to inspect areas that are difficult to see at home.

If you notice something unusual, avoid repeatedly picking at it, attempting to remove it yourself, or relying exclusively on online photographs for diagnosis.

Instead, make note of when you first noticed it, whether it is changing, whether it hurts or bleeds, and whether you have developed any additional symptoms. That information can help your dentist or doctor evaluate the problem.

And if symptoms are severe, rapidly worsening, or accompanied by significant difficulty breathing or swallowing, urgent medical attention is appropriate.

Your mouth can sometimes provide clues that something needs attention—but a clue is not a diagnosis.

The smartest response to a persistent change is not panic. It is getting the change properly evaluated.