Why do I have a bump on my mouth inside the cheek? (pictures)

If you've recently noticed a bump on the inside of your cheek, you might be wondering what it is and what you should do about it.

In this article, we'll provide you with the information you need to know exactly what this bump is, and give you guidance on the steps to take.

Please keep in mind that while most bumps in the mouth are harmless, it's always a good idea to see a dentist or healthcare professional if you notice one. Only they can give you an accurate diagnosis and recommend an appropriate treatment plan.

What can a bump on the mouth, inside the cheek mean?

If you notice a bump on the inside of your cheek, there's no need to panic. Most of them are benign and nothing to worry about.

While certain symptoms can give you an idea, the only way to know for sure is through a biopsy and lab test, as many harmless growths can look alike.

Here are some of the most common lumpy mouth lesions:

1. You have a single non-painful bump on your cheek

This type of lump is fairly common in the mouth and usually develops due to constant, long-term irritation from things like repeatedly biting your cheeks or wearing an old, poorly fitting denture.

We call them fibrous overgrowth because they result from a benign overgrowth of fibroblast cells, which start producing too much collagen protein. The medical term for these harmless tumors is Fibroma.

They appear as a single mass, between 1 and 2 centimeters in size (roughly the size of a pea), which may be firm or soft to the touch. They can grow flat against the mouth lining or hang by a small stem.

Its surface is usually smooth and has the same color as the surrounding tissue, but it can sometimes be inflamed and turn white or red due to injury. Fibromas are not and never turn into cancer.

In rare cases, the lump may bleed easily when touched. When this happens, the growth is made up primarily of blood vessels and rapidly grows to about half an inch in size. They are often found in pregnant women because of hormonal changes.

2. You have a soft, blister-like lump

A soft, clear, or bluish lump anywhere in your mouth is usually a sign of a mucocele (also known as a mucoid cyst). Along with fibromas, they are one of the most common growths of the mouth (affecting around 2.4 out of every 1,000 people).

It doesn’t have the firm texture of a tumor. Instead, the cyst is softer, and when you touch it, you can feel that it’s filled with fluid.

It happens when the ducts of the salivary glands — which release saliva into your mouth — get injured. When this happens, saliva gets trapped in the inner layer of your mouth. This can lead to a swelling that may be painful and can range in size from a few millimeters to a few centimeters.

3. You have multiple blister-like lesions and painful ulcerations

Having many painful, blister-like spots at once is usually a sign of a viral infection. This is most often caused by a herpes outbreak (commonly known as cold sores). But other viruses, like the varicella-zoster virus, can also cause many blisters to appear.

These can appear in different parts of the mouth, including the lips, inside of the cheeks, and gums. They soon break open to leave painful ulcers, which usually heal on their own within 10-14 days.

Other conditions that can cause blister-like lesions include mucosal pemphigoid and pemphigus. These are rare autoimmune diseases where the body’s immune system mistakenly attacks its own cells.

4. You have a painless lump with a cauliflower-like surface

This type of lesion is not uncommon and appears most often inside the cheeks, the gum, and the lips.

They are associated with the human papillomavirus (HPV) which causes single or multiple bumps to appear on the lining of the mouth. They are often painless and have a rapid growth rate that stops when they reach the size of about one centimeter. They are covered with a pink or white layer with a striated surface similar to that of a cauliflower.

These mouth lesions appear as a result of HPV infection transmitted orally.

5. Your cheek is swollen from the outside

Swelling inside your cheek with a surface that looks like the surrounding tissue may indicate a benign salivary gland tumor. These are less common than other benign growths like fibromas or mucoceles.

The most common type is called Pleomorphic Adenoma. It usually feels like a firm lump, ranging in size from a few millimeters to several centimeters, and grows slowly without causing pain.

These benign tumors most often affect the parotid glands, which sit just in front of and below each ear. If the tumor is in the parotid gland, swelling might be visible outside the mouth.

However, salivary glands are found throughout the mouth, so any area can be affected.

Even though the risk of these tumors turning cancerous is low, regular monitoring is essential to stay safe.

Why are bumps more likely to form on the inside of cheeks?

The inside of your cheek is lined with delicate tissue that's more susceptible to irritation and injury. Plus, this area of the cheek is right up against the teeth, making it more prone to repeated rubbing and biting.

This can lead to the formation of sores, cysts, or bumps when the tissue reacts to the irritation.

Can you tell exactly what the bump really is? Again, symptoms can give a good clue, but only a microscopic examination (biopsy) can reveal its true nature.

Fortunately, most bumps in the mouth lining are benign and don’t threaten your health. They usually stay where they first appear and grow slowly without spreading into surrounding tissues.

When to Worry About a Bump

While most lumps inside the mouth are harmless and don't have any cancerous potential, some oral lesions can be dangerous and have a significant risk of becoming malignant.

One common symptom to watch for is white patches in different areas of your mouth that can be either raised or flat. These may be a sign of a pre-cancerous condition called leukoplakia. It can appear anywhere in the mouth but is most common on the tongue, the inside of the cheeks, and the lower lip.

These white patches are firmly attached to the oral lining and cannot be wiped off.

Another sign to watch for is persistent red patches. These may indicate another pre-cancerous condition known as erythroplakia. This should be checked closely because it carries a higher risk of developing into cancer.

Other symptoms to watch out for include:

• The bump is growing or seems out of place: Benign growths usually grow slowly and stop once they reach a certain size. If the lump is growing quickly or keeps getting bigger, please have it checked as soon as possible.


• The boundaries look larger than they seem: Benign growths tend to stay in the area where they first appear and remain there for years. Cancerous growths, however, often have uneven or irregular edges and are more aggressive — they can invade and destroy surrounding tissues.


• Swollen lymph nodes: Swelling under your lower jaw or in your neck may be a sign that your lymph nodes are reacting to something. This is most often due to an infection, but it can sometimes indicate something more serious.


• Persistent pain: Benign lesions are usually painless unless they get injured. Oral cancer also rarely causes pain in its early stages, but if it grows larger and starts pressing on nearby nerves, it can cause a strange tingling or persistent pain.


• Unexplained bleeding: Chronic or unexplained bleeding in the mouth — whether from the gums, tongue, or any other area — should always be taken seriously and checked by a dentist.

Aggravating factors

Many factors can increase the risk of developing growths or lesions in the mouth — and may also make them worse. Combined with genetics, these factors can make some people more prone to mouth lumps, and even oral cancer. Some of these factors include:

• Smoking: Tobacco contains a large number of carcinogens and toxins that can affect the oral mucosa. Smoking also increases the temperature of the mouth, which can irritate it.


• Alcohol: Alcohol has a synergistic effect with tobacco. People who smoke and drink at the same time have a 35 times higher risk of developing oral cancer.


• Infections: Some viral infections such as herpes virus, human papillomavirus, and HIV increase the risk of oral lesions.


• Hormonal imbalance: Some hormonal conditions can affect the mouth resulting in red, swollen, and bleeding gums, swollen salivary glands, and the development of canker sores.


• Chronic irritation: Repeated and long-lasting mouth irritation from ill-fitting dentures, biting your cheeks, or hot and spicy foods can injure your mouth tissues.


• Nutritional deficiency: The deficiency of certain nutrients, especially vitamins A, C, and B-complex, can be associated with certain mouth lesions.

How to deal with a bump in the mouth?

Most mouth bumps or growths are benign, grow slowly, don’t damage surrounding tissue, and may not even require any treatment.

However, some more serious (but rare) conditions can appear early as a bump, white or red patch, or ulcer.

To be safe, any change in your mouth — no matter how small it may seem — that doesn’t heal within 10 days should be checked by your dentist or a healthcare professional.

If the growth looks suspicious, it may need to be biopsied to find out exactly what it is.

Never try to remove or scrape a mouth lump at home, as this can make it worse or lead to an infection.

Once diagnosed, treatment usually involves surgical removal. It’s also important to address any risk factors, such as infections, smoking, or chronic irritation, to prevent the growth from coming back.