Should I worry about a new dark spot on my tongue?

A new dark spot on your tongue is usually harmless, but it shouldn't be ignored if there's no obvious cause or it doesn't go away within two weeks. Most dark spots are caused by harmless things like natural pigmentation, a small bruise or a reaction to dental work. Knowing what's causing the spot can help you decide whether it's safe to watch or time to have your dental provider take a closer look.

What you'll learn in this article:

• Most dark spots on the tongue are harmless and are often caused by an amalgam tattoo, natural pigmentation or a minor bruise.

• Natural pigmentation is common, especially in people with darker skin tones, and usually isn't a cause for concern.

• A dark spot that lasts longer than two weeks, changes in appearance or becomes uncomfortable should be evaluated.

• In most cases, your dental provider can identify the cause with a quick oral exam and recommend the right next step.

If a dark spot on your tongue has lasted more than two weeks or appeared without an obvious explanation, schedule an appointment with your Aspen Dental provider for an oral evaluation.

What causes a dark spot on the tongue?

Dark spots on the tongue have several common explanations, and most are completely harmless. Here are the most likely causes.

Is it an amalgam tattoo?

An amalgam tattoo can cause a small blue, gray or black spot in the mouth. It happens when a tiny piece of material from a silver dental filling becomes trapped in nearby tissue. On the tongue, it may appear as a small blue-black spot, often on the underside.^¹ If you have had dental work near the area, your dental provider can determine whether an amalgam tattoo is the cause.

Could natural pigmentation cause this?

Yes. Healthy tissue inside the mouth can range from pink to shades of brown or black. People with darker skin often have more natural pigmentation because the cells that produce melanin are more active.² If the area has been present for a long time and has not changed, it may be normal pigmentation. A new or changing spot should still be evaluated.

What about a blood blister or bruise?

If you recently bit your tongue, burned it on something hot or had dental work done, a dark spot may simply be a blood blister or bruise. These typically appear quickly after the incident, range in color from deep red to dark purple and resolve within one to two weeks. If the area hasn't healed within that time, it's worth having your dental provider take a look.

What is black hairy tongue?

Black hairy tongue is a temporary condition in which keratin and debris collect on the small projections on the tongue, making the surface look dark or hairy. It may develop when the mouth is not cleaned well or after antibiotic use. Cleaning the tongue gently and improving oral hygiene can help clear the buildup.¹

When should a dark spot concern you?

Most dark spots are benign — but some behave in ways that warrant a closer look. Watch for these signs:

• The spot appeared without a clear explanation and has been there for more than two weeks

• The spot has changed in size, shape or color since you first noticed it

• The area bleeds on its own or when touched

• You notice tenderness, numbness or a sore in the same area that won't heal

• The spot feels raised or thickened rather than flat

These signs don't confirm anything serious, but they do mean an oral exam is the right next step.³ Changes in mouth tissue can progress quickly, and identifying anything unusual early makes a meaningful difference in outcomes.

What to expect at an oral evaluation

An oral evaluation for a dark spot on your tongue is quick and straightforward. Your dental provider will examine the area and ask when you first noticed it, whether it has changed, and if anything happened beforehand, such as dental work or accidentally biting your tongue. In many cases, the cause is clear from the exam alone. If more evaluation is needed, your dental provider will explain the next steps and why they're recommended.

If a dark spot has been there for more than two weeks or has changed in size, shape or color, have your dental provider take a look. It's a simple step that can provide a clear diagnosis and, when needed, prompt treatment.

Should I worry about a new dark spot on my tongue? FAQs

If you still have questions about a dark spot on your tongue, including when it's time to have it checked, these answers can help.

Will I need a biopsy if the cause isn't clear?

Not necessarily. In most cases, your dental provider can identify the cause from a visual exam alone. If the spot looks unusual or doesn't fit a clear explanation, your dental provider may refer you to an oral surgeon or specialist for further evaluation. A biopsy (a small tissue sample sent to a lab for analysis) is sometimes recommended when a spot has characteristics that need closer examination. It's a minor, straightforward procedure, and it's the most reliable way to get a definitive answer. Knowing is always better than wondering.

Is a dark spot on my tongue a sign of oral cancer?

Most dark spots in the mouth are not cancer. However, oral cancer can cause an unusual spot, sore, lump or thickened area, as well as numbness or trouble swallowing. Any unexplained change that lasts longer than two weeks should be evaluated. These symptoms often have causes other than cancer, but getting them checked early is important.³

How do I reduce my risk of unusual tongue changes?

Good oral hygiene is your best tool. Brush your tongue gently each time you brush your teeth, stay well hydrated, limit tobacco use and get regular dental checkups. Routine oral exams allow your dental provider to catch unusual changes early — often before you'd notice them yourself. If you do notice something new between appointments, don't wait for your next scheduled visit to mention it.

Sources

¹Merck Manual (Consumer Version): “Tongue Discoloration and Other Changes” https://www.merckmanuals.com/home/mouth-and-dental-disorders/lip-and-tongue-disorders/tongue-discoloration-and-other-changes

²Merck Manual Consumer Version. “Biology of the Mouth.” https://www.merckmanuals.com/home/mouth-and-dental-disorders/biology-of-the-mouth-and-teeth/biology-of-the-mouth

³National Institute of Dental and Craniofacial Research. “Oral Cancer Causes and Symptoms & the Oral Cancer Exam.” https://www.nidcr.nih.gov/sites/default/files/2021-01/oral-cancer-causes-symptoms.pdf