Nasolabial Cyst

What is a nasolabial cyst?

A nasolabial cyst is a rare, non-cancerous (benign) fluid-filled sac that forms in the soft tissue of the face where the side of the nose meets the upper lip. This area is called the nasolabial fold, the crease that runs from the nostril down toward the corner of the mouth. The cyst sits just under the wing of the nostril (the ala of the nose) and above the gum line, in the soft tissue rather than inside the bone. You may also see it called a nasoalveolar cyst or a Klestadt cyst; these are older names for the same condition.

Doctors classify a nasolabial cyst as a developmental cyst, meaning it is thought to arise from tissue left behind while the face was forming before birth, rather than from an infection or a tooth problem. Even so, it usually does not become noticeable until adulthood. It is most often diagnosed in adults in middle age, and it is reported more often in women than in men. In most people it appears on one side of the face only, although both sides can be affected in a small number of cases.

Because the swelling sits in an area shared by the nose, the upper lip and the upper jaw, a nasolabial cyst may first be noticed by a dentist, a family doctor or an ear, nose and throat (ENT) specialist. In many hospital groups, including Acibadem, this condition is managed by the Otorhinolaryngology (ENT) department, sometimes together with oral and maxillofacial surgeons.

Nasolabial cyst symptoms

Nasolabial cyst symptoms usually develop slowly over months or years. Many people notice only a soft, painless lump at first. Common features include:

• A soft, rounded swelling in the nasolabial fold, next to the nostril
• Flattening or loss of the natural crease between the nose and upper lip
• Lifting or widening of the nostril on the affected side, so the nose looks uneven
• Fullness of the upper lip that can be felt from inside the mouth, above the front teeth
• A feeling of pressure or a blocked nostril on the affected side
• Mild discomfort when pressing on the area or when smiling
• Sudden pain, redness, warmth and rapid enlargement if the cyst becomes infected

The lump itself is typically smooth, moves slightly under the skin and does not feel attached to the bone. Because the cyst lies in soft tissue, it does not usually cause tooth pain, loose teeth or changes to the gums, which helps doctors tell it apart from cysts that come from the roots of teeth.

Symptoms vary with the size and stage of the cyst. A small cyst may cause no symptoms at all and may be found by chance during a dental examination or a scan done for another reason. As it grows, cosmetic changes to the nose and lip become more obvious, and the nasal passage on that side may feel narrower. If bacteria enter the cyst, it can become infected. An infected nasolabial cyst tends to swell quickly, feel hot and tender, and may drain pus into the nose or the mouth. Infection is often the reason a person seeks medical care for a lump they had ignored for a long time.

Causes and risk factors

The exact nasolabial cyst causes are not fully understood, but two main explanations are widely discussed. The most accepted theory is that the cyst develops from leftover cells of the nasolacrimal duct, the small channel that carries tears from the eye to the nose. During facial development before birth, small groups of these cells may become trapped in the soft tissue beside the nose. Years later, these cells can begin to produce fluid, gradually forming a cyst. This idea is supported by the type of lining cells found when the cyst is examined under a microscope.

An older theory, sometimes called the fissural theory, suggests that the cyst forms from skin-like cells trapped where three parts of the developing face meet and fuse: the segments that become the side of the nose, the middle of the nose and the upper jaw. Many specialists now consider this explanation less likely, but it is still mentioned in medical texts.

What is clear is that a nasolabial cyst is not caused by poor dental hygiene, is not caused by tooth decay and is not thought to be contagious or inherited in a simple way. There is no known link to any specific lifestyle habit.

Known risk factors are limited because the condition is rare. Factors that appear more frequently among people who are diagnosed include:

• Being an adult, most often between roughly the fourth and sixth decades of life
• Female sex, since the condition is reported more often in women
• A previous episode of swelling or infection in the same area, which may draw attention to an existing cyst

It is worth stressing that having one of these characteristics does not mean a person will develop a nasolabial cyst; they simply describe the group in which it is most commonly seen.

Nasolabial cyst diagnosis

Nasolabial cyst diagnosis begins with a careful history and physical examination. Your doctor will ask when you first noticed the lump, whether it has changed in size, and whether it has ever become painful or drained fluid. During the examination, the doctor may use a technique called bimanual palpation: one gloved finger is placed inside the nostril or under the upper lip, and another finger presses on the skin outside. A nasolabial cyst can usually be felt between the two fingers as a soft, fluid-filled swelling in the soft tissue, with no hard attachment to the bone beneath.

Because several other conditions can cause a swelling in this area, doctors also look for signs that point away from a nasolabial cyst. They may check that the nearby upper teeth are healthy and alive (vital), since a cyst arising from an infected tooth root is one of the most common alternative explanations. Other conditions that can look similar include a skin cyst (epidermoid cyst), a boil (furuncle), a dental abscess, a cyst of the nasopalatine duct behind the front teeth, and, rarely, a benign or malignant tumor of the soft tissue or salivary tissue.

Imaging helps confirm the diagnosis and plan treatment:

• Dental X-rays or panoramic X-ray are often normal because the cyst is in soft tissue, but they help rule out a tooth-related cause. A large cyst may leave a faint, smooth dent on the surface of the upper jawbone.
• Computed tomography (CT), a detailed X-ray scan, typically shows a well-defined, rounded, fluid-density lump beside the nose. It can also show whether long-standing pressure has thinned the bone of the upper jaw.
• Magnetic resonance imaging (MRI), which uses magnets rather than radiation, shows the fluid content and the soft-tissue borders clearly and can help distinguish a cyst from a solid tumor.
• Ultrasound may be used as a simple, radiation-free test to confirm that the lump is fluid-filled.

In some cases, a doctor may use a fine needle to draw a small amount of fluid from the cyst (fine-needle aspiration). The fluid is usually clear or slightly cloudy and thick. However, needle aspiration alone does not remove the cyst, and many specialists prefer to avoid it because it may introduce infection or make later surgery slightly more difficult.

The final, definitive diagnosis is made after the cyst has been removed and examined under a microscope (histopathology). The pathologist looks for a lining of specific cell types, often including mucus-producing goblet cells, which supports the diagnosis of a nasolabial cyst and confirms that no cancerous cells are present.

Nasolabial cyst treatment options

Nasolabial cyst treatment depends on the size of the cyst, the symptoms it causes and whether it is infected. There is no medication that dissolves the cyst, so the standard approach for a cyst that causes symptoms is a minor surgical procedure.

Observation. If a cyst is very small, causes no symptoms and the diagnosis is clear on imaging, some doctors may suggest monitoring it rather than operating right away. However, because the cyst tends to grow slowly and can become infected, most specialists recommend removal once it is causing a visible change or discomfort.

Antibiotics for infection. If the cyst is infected, your doctor may prescribe antibiotics and, in some cases, drain the pus to relieve pressure and pain. This treats the infection but does not remove the cyst lining, so the cyst is likely to refill. Surgery is usually planned once the inflammation has settled, because operating on a calm, non-infected cyst is easier and allows more complete removal.

Surgical excision through the mouth. The most common procedure is complete removal of the cyst through a small cut made inside the mouth, in the fold between the upper lip and the gum (the sublabial approach). This leaves no visible scar on the face. The surgeon carefully separates the cyst from the surrounding tissue and from the floor of the nostril, then closes the incision with dissolving stitches. The procedure is usually done under local anesthesia with sedation or under general anesthesia and often takes less than an hour. If the cyst wall is stuck to the lining of the nostril, a small piece of nasal lining may be removed with it to reduce the chance of the cyst coming back.

Endoscopic marsupialization through the nose. A less common alternative uses a thin camera (endoscope) passed through the nostril. The surgeon opens the cyst into the floor of the nasal cavity and removes part of its wall so that it drains permanently into the nose and cannot refill. This approach avoids an incision in the mouth and may involve a shorter recovery, but it is not suitable for every cyst, and long-term results are still being studied.

Recovery and rehabilitation. After surgery, mild swelling of the upper lip and numbness of the lip or upper front teeth are common and usually improve over several weeks. Your surgeon may advise a soft diet for a few days, gentle rinsing of the mouth, and avoiding vigorous nose blowing while the tissues heal. Most people return to normal activities within a few days to a week. Formal rehabilitation is not usually needed.

Possible complications of any procedure include bleeding, infection, temporary or, rarely, lasting numbness of the lip or gum, and a small opening between the mouth and the nose that may need repair. Recurrence is uncommon when the cyst is removed completely, but it can happen if part of the lining is left behind.

Living with a nasolabial cyst and outlook

The outlook for people with a nasolabial cyst is generally good. The cyst is benign, and there are no well-established reports of it turning into cancer. Left untreated, it tends to grow slowly over years, gradually changing the shape of the nose and lip and increasing the risk of infection. It does not spread to other parts of the body.

After complete surgical removal, most people experience a return of the normal facial contour and relief of nasal blockage on that side. Some mild changes in sensation around the upper lip may linger for a few months. Recurrence is considered uncommon, but your doctor may ask you to attend one or more follow-up visits to check healing and to make sure the swelling does not return.

If you choose to observe a small cyst rather than have it removed, it can help to note its size and appearance so you can report any change. Keeping the nose and mouth clean and treating colds and sinus infections promptly may lower the chance of the cyst becoming infected, although this cannot be guaranteed. Your doctor may also suggest regular dental check-ups, since a healthy mouth makes future diagnosis and any surgery simpler.

Frequently asked questions

Is a nasolabial cyst dangerous?

A nasolabial cyst is benign, meaning it is not cancer and does not spread. The main problems it causes are cosmetic change, nasal blockage on one side and occasional infection. It is not usually considered dangerous, but a lump on the face should always be checked by a doctor so that other, more serious causes can be ruled out.

What are the first nasolabial cyst symptoms people notice?

Most people first notice a soft, painless swelling beside the nostril or a subtle lifting of one side of the nose. Some notice that the crease between the nose and upper lip has become flatter, or that one nostril feels slightly blocked. Pain is often absent unless the cyst becomes infected.

What are the main nasolabial cyst causes?

The most widely accepted explanation is that the cyst develops from cells left over from the tear duct (nasolacrimal duct) during facial development before birth. An older theory suggests trapped cells at the junction of developing facial segments. It is not caused by tooth decay, poor hygiene or an injury, and it is not known to be inherited.

How is nasolabial cyst diagnosis confirmed?

Doctors usually suspect a nasolabial cyst from the location and feel of the lump, especially when it can be felt between a finger inside the nose or mouth and a finger on the skin. A CT or MRI scan supports the diagnosis and rules out tooth-related cysts and tumors. Final confirmation comes from examining the removed cyst under a microscope.

Can a nasolabial cyst go away on its own?

A nasolabial cyst does not usually disappear by itself, because the lining continues to produce fluid. It may shrink temporarily if it bursts or is drained, but it commonly refills. Complete removal of the cyst lining is the treatment that is generally expected to resolve it.

What does nasolabial cyst treatment involve and will it leave a scar?

Standard nasolabial cyst treatment is surgical removal through a small cut inside the mouth, which leaves no visible scar on the face. Some surgeons offer an endoscopic procedure through the nostril instead. Recovery is usually quick, with mild lip swelling and temporary numbness that typically improve over weeks.

Can a nasolabial cyst come back after surgery?

Recurrence is uncommon when the entire cyst wall is removed. It may happen if a small part of the lining is left behind, particularly where the cyst is attached to the floor of the nose. Follow-up visits allow your doctor to check for any return of swelling.

When to see a doctor

Any new or growing lump on the face deserves a medical evaluation, even if it is painless. A doctor can determine whether it is a nasolabial cyst, a dental problem or another condition. Seek care promptly, and treat the following as urgent warning signs:

• Rapid enlargement of the swelling over hours or days
• Severe pain, redness, warmth or spreading swelling of the cheek, lip or eyelid
• Fever or chills together with a swollen, tender lump near the nose
• Pus or foul-smelling fluid draining into the nose or mouth
• Difficulty breathing through both nostrils or difficulty opening the mouth
• Numbness of the face that appears suddenly or worsens
• A lump that feels hard, fixed or irregular, or that bleeds without injury
• Loosening of teeth, unexplained tooth pain or changes in vision

These signs may indicate a spreading infection or a condition other than a simple cyst and should be assessed without delay. Infections in the middle of the face can occasionally spread toward the eye or deeper tissues, so early treatment is important.