Lower lip fistula is a rare birth difference with one or two small openings on the lower lip. It is usually noticed at birth or in early childhood, and many people with lower lip fistula have no pain but may have saliva or mucus drainage from the pits. Not everyone will have the same experience. Lower lip fistula is usually lifelong, but it is not usually life-threatening, and treatment is often not needed unless there is leakage, irritation, or a cosmetic concern. When early signs of lower lip fistula are present, doctors may also check for a cleft lip or cleft palate because these can occur together in some families.
How many people live with Lower lip fistula?
Reliable worldwide and U.S. estimates for lower lip fistula, a very rare condition with one or more small openings in the lower lip, are not consistently reported by a single trusted source. Orphanet lists it as a rare disease, but a dependable global count and a separate U.S. count are not available (Orphanet, 2024).
Overview
Lower lip fistulaSymptoms
Lower lip fistula is a small pit or opening on the lower lip, usually present at birth. Many people with lower lip fistula have no pain, but some may notice saliva or mucus leaking from the opening.
Outlook and prognosis
For most people, the outlook for lower lip fistula is very good, and it does not affect life expectancy. Many living with lower lip fistula need no treatment, while some choose a small procedure if saliva leaks or the opening is bothersome.
Causes and risk factors
Lower lip fistula usually results from a genetic change before birth, often inherited in families and sometimes linked to Van der Woude syndrome. Risk is higher with an affected parent. Lifestyle or environmental factors are not known primary causes.
Genetic influences
Genetics are very important in Lower lip fistula, which is often inherited and commonly linked to changes in the IRF6 gene. Genetic variations can affect whether Lower lip fistula appears alone or with other features, so genetic counseling may help families understand recurrence risk.
Diagnosis
Lower lip fistula is usually diagnosed by a clinician during an exam, based on the small pits or openings on the lower lip. The diagnosis of lower lip fistula may be confirmed with genetic tests when it runs in families or occurs with other features.
Treatment and drugs
Lower lip fistula often needs no treatment if it causes no trouble. If saliva leakage, irritation, or cosmetic concerns matter, a surgeon can remove the small tract. Medicines are usually only for short-term infection or after surgery.
Symptoms
Lower lip fistula usually shows up as one or two tiny openings on the lower lip that are present from birth. For many people with lower lip fistula, the main day-to-day issue is occasional moisture, saliva leakage, or concern about appearance rather than pain. The early features of lower lip fistula are often subtle, so they may first look like small dimples until fluid drains or the area becomes irritated. Some people have lower lip fistula on its own, while others also have a cleft lip, cleft palate, or dental differences.
The most common sign is one or two small pits on the lower lip, usually near the center. They may look like dimples or pinpoints and are often present on both sides.
Clear saliva or mucus can come from the openings, especially when eating, talking, or pressing on the lip. This may leave the lip feeling wet or cause mild crusting.
Repeated moisture can make the nearby skin sore, red, or chapped. Wiping or licking the area often can make the irritation worse.
If the small channel under the opening gets blocked, the area can swell and feel tender. Sometimes the drainage becomes thicker, and the lip may look puffy for a time.
How people usually first notice Lower lip fistula?
Lower lip fistula is usually first noticed at birth or during an early newborn exam, when a doctor or parent sees one or two small, symmetric openings or dimples on the lower lip. In many babies, these lower lip pits do not cause pain, but some may have clear saliva-like drainage, repeated moisture, or mild irritation, which is often what makes families pay closer attention. Because the first signs of lower lip fistula can also occur with a cleft lip, cleft palate, or a family history of similar lip changes, doctors often look carefully for these related features early on.
Types of Lower lip fistula
No distinct types of Lower lip fistula are widely recognized.
Can I slow down the onset of symptoms?
No, not in a meaningful way. A lower lip fistula is a small opening or tunnel in the lower lip that usually forms before birth, so lifestyle changes like diet, exercise, or supplements are not known to delay when it appears or prevent later symptoms; avoiding lip irritation may help with comfort, but it does not change the condition itself. The good news is that many people have few problems, and if drainage, repeated irritation, or appearance becomes bothersome, a clinician can talk with you about treatment options, which can help manage symptoms even though they do not prevent the condition.
What genetics can tell you about symptoms
Genetics can sometimes help explain why lower lip fistulas happen alongside other features rather than on their own. Changes in genes such as IRF6, and less often GRHL3, are linked to syndromes in which lower lip fistulas may occur with cleft lip, cleft palate, missing teeth, or differences in how the mouth develops, so genetics may give clues about which features are more likely to appear and how early they are noticed. Even within the same family, though, symptoms can vary a lot, so genetic results cannot always predict exactly how mild or severe the condition will be.
Causes and risk factors
Lower lip fistula usually starts very early in pregnancy, when the lower lip does not form in the usual way. The main causes of lower lip fistula are genetic changes, especially in the IRF6 gene, and these changes may be inherited or may happen for the first time in a child. It is more likely in families with a history of lower lip fistula, cleft lip, cleft palate, or Van der Woude syndrome. Most lifestyle and environmental factors are not proven causes, but researchers are still learning how these pieces fit together. Genetic testing can sometimes clarify your personal risk.
What are the most common causes or risk factors?
Lower lip fistulas are usually present from birth and happen when the lower lip does not form fully very early in pregnancy. The strongest risk factor is family history, because they often run in families and can be part of an inherited condition such as Van der Woude syndrome, which may also be linked with a cleft lip or cleft palate. Some cases happen on their own, and there are no well-proven lifestyle or environmental risk factors for the pregnant parent.
Environmental and biological risk factors
If you are looking into what can increase the chance of lower lip fistula at birth, the answer is often less clear than people expect. Doctors often group risks into internal (biological) and external (environmental). For lower lip fistula, many isolated cases happen without one clear cause, but a few early-pregnancy factors are linked with a higher chance of facial birth differences.
Diabetes that is present before pregnancy, or develops early in pregnancy, can increase the chance of some facial birth differences. The link is strongest when blood sugar levels are hard to control during the weeks when the lip is forming.
Exposure in early pregnancy to medicines known to affect fetal development, such as vitamin A-related acne treatments and some seizure medicines, can raise the risk of lip and palate differences. Evidence for lower lip fistula specifically is limited, but these medicines are recognized causes of certain facial birth defects.
High-dose radiation and some harmful chemical exposures, including certain solvents or heavy metals, can interfere with early facial development. These exposures are uncommon, and the evidence is stronger for facial birth differences in general than for lower lip fistula alone.
A significant fever or serious infection early in pregnancy may increase the risk of some birth differences affecting the face. This is not known to explain most cases of lower lip fistula, but it is considered a possible environmental risk during the weeks when the lip is developing.
Genetic risk factors
For many living with lower lip fistula, the change started very early in development and often runs in families. The genetic causes of lower lip fistula most commonly involve genes that help the lips and roof of the mouth form before birth, especially when lip pits occur along with a cleft lip or cleft palate. Lower lip fistula can appear on its own or as part of an inherited syndrome, most often Van der Woude syndrome. Carrying a genetic change doesn’t guarantee the condition will appear.
IRF6 changes: Changes in the IRF6 gene are the best-known genetic cause of lower lip fistula. This gene helps guide normal formation of the lips and palate before birth. These changes are especially common when lower lip fistula is part of Van der Woude syndrome.
GRHL3 changes: Less often, changes in the GRHL3 gene can also be linked to lower lip fistula. These changes are usually found in families with Van der Woude syndrome and may be accompanied by cleft lip, cleft palate, or both.
Van der Woude: Lower lip fistula is a classic feature of Van der Woude syndrome, an inherited condition that can also include cleft lip, cleft palate, or missing teeth. When this syndrome runs in a family, the chance of seeing lower lip fistula in relatives is higher.
Popliteal pterygium: In a small number of families, lower lip fistula occurs as part of popliteal pterygium syndrome. This rare syndrome is usually also linked to changes in IRF6 and tends to cause other birth differences as well.
Family history: Having a parent or close relative with lower lip fistula, Van der Woude syndrome, or a related cleft condition raises the genetic chance for this finding. In many families, the trait passes from one generation to the next.
Dominant inheritance: Lower lip fistula related to IRF6 or GRHL3 often follows an autosomal dominant pattern. That means a child can inherit the condition from one affected parent, although the signs may be milder or more noticeable from person to person.
New gene change: Sometimes lower lip fistula appears in someone with no known family history because a new genetic change happened for the first time in that child. This is uncommon, but it is a well-recognized reason the condition can appear unexpectedly.
Lifestyle risk factors
Lower lip fistula is usually a congenital finding, so lifestyle habits do not cause it. Still, how lifestyle affects lower lip fistula can matter for irritation, saliva leakage, odor, local infection, and care after any procedure. The most useful lifestyle factors are those that reduce friction, keep the area clean, and limit behaviors that inflame the lips and mouth.
Inconsistent mouth and lip hygiene can allow saliva, food debris, and bacteria to collect around the pits. This can increase bad odor, local irritation, and the chance of repeated inflammation or infection.
Picking, squeezing, or frequently licking the lower lip can irritate the fistula openings and surrounding skin. Repeated trauma may worsen redness, drainage, soreness, or crusting.
Smoking or vaping can dry and inflame the lips and oral lining. This may aggravate discomfort around a lower lip fistula and can impair healing if surgery is needed.
Poor hydration can make lips drier and more likely to crack around the fistula sites. Good fluid intake may help reduce dryness-related irritation and improve comfort.
Risk prevention
Because lower lip fistula is usually present from birth, there is often no way to prevent the pits themselves from forming. For many living with lower lip fistula, prevention is really about lowering the chance of irritation, drainage problems, infection, or delays in finding related conditions such as cleft lip or cleft palate. Different people need different prevention strategies—there’s no single formula. If lower lip fistula runs in a family, genetic counseling before or during pregnancy may help clarify risk, but it cannot guarantee prevention.
Keeping the lips clean and protected can help lower the risk of irritation around a lower lip fistula. Many find that avoiding lip biting, picking, or frequent licking helps the area stay calmer.
Redness, swelling, pain, bad-smelling drainage, or a new lump near the pit can be early signs of trouble. Getting these symptoms checked promptly may help prevent a small problem from turning into an infection.
Regular dental care can help prevent saliva pooling, irritation, and other mouth issues that may make lower lip fistula more uncomfortable. This is especially helpful if food, plaque, or dryness tends to collect around the lower lip.
An exam by a clinician familiar with lower lip fistula can help spot related differences, including cleft palate that may be easy to miss early on. Early review can support feeding, speech, and dental planning if needed.
Can you prevent Lower lip fistula?
Usually, no—there is no proven way to prevent a lower lip fistula, because it usually forms very early in pregnancy and is often linked to genes. If it runs in your family, genetic counseling can help you understand the chance of it happening, but it cannot fully prevent it.
Transmission
Lower lip fistula is a congenital change in the lower lip, so it is not infectious and cannot be caught through kissing, sharing food, or close contact. In some families, lower lip fistula is inherited, sometimes along with cleft lip or cleft palate.
If a parent has the inherited form, each child has about a 1 in 2 chance of being born with it, although it can look milder or more noticeable in different family members. Sometimes lower lip fistula happens for the first time in a child because of a new genetic change, so there may be no family history; this is part of how Lower lip fistula is inherited.
When to test your genes
Consider genetic testing if lower lip fistulas occur with a cleft lip, cleft palate, missing teeth, or a family history of these findings. Testing can help confirm a syndrome such as Van der Woude syndrome, clarify recurrence risk, and guide screening for related features in you and your relatives.
Diagnosis
Lower lip fistula is usually recognized by its appearance, often in infancy or childhood, though some people are diagnosed later if the openings are very small and cause few problems. Doctors usually make the diagnosis of lower lip fistula by examining the lower lip closely and checking for related differences in the mouth or face. Getting a diagnosis is often a turning point toward answers and support.
A doctor looks for one or two small pits or openings on the lower lip, usually placed symmetrically near the center. Gentle pressure may show a small amount of saliva or mucus coming from the tract, which helps confirm what is being seen.
Because lower lip fistula can occur along with a cleft lip, cleft palate, or a split in the soft tissue under the tongue, the mouth is examined carefully. This helps doctors spot related features that can affect feeding, speech, or dental care.
Some conditions have a genetic link, meaning they can run in families. Asking about relatives with lower lip fistula, cleft lip, or cleft palate can help show whether an inherited syndrome may be involved.
If lower lip fistula appears with clefting or a strong family pattern, genetic tests may be offered to look for an underlying inherited cause such as Van der Woude syndrome. This can clarify the genetic diagnosis of lower lip fistula and help with family counseling.
How is Lower lip fistula diagnosed?
Lower lip fistula is usually diagnosed during a physical exam, when a doctor sees one or two small openings or pits on the lower lip, sometimes with a little clear drainage. The doctor will also look for related differences, especially a cleft lip or cleft palate, and ask about family history because these lip pits can run in families. Genetic testing may be offered if there are other signs or a strong family history, but the diagnosis is most often made by the way the lip looks on exam.
Stages of Lower lip fistula
Lower lip fistula does not have defined progression stages. This is because it is usually a birth difference in the lower lip rather than an illness that gradually worsens over time. Doctors usually start with a conversation about when the lip changes were first noticed, then confirm the finding with a simple exam of the mouth and lips. In some cases, especially when there are other cleft lip or palate features or a family history, how lower lip fistula is diagnosed may also include referral for genetics advice or checks for related differences.
Outlook and prognosis
The outlook for people with lower lip fistula is generally excellent, especially when the finding is isolated and does not affect feeding, speech, or overall health. Many people never need treatment, and when surgery is chosen for cosmetic reasons or because of recurrent drainage, irritation, or infection, results are usually very good with a low risk of recurrence if the tract is completely removed. Prognosis also depends on whether the lip fistula occurs as part of an inherited syndrome such as Van der Woude syndrome, in which case associated cleft lip, cleft palate, dental differences, or speech issues may have a greater impact on long-term outcomes than the fistula itself. Mortality is not increased by an isolated lower lip fistula, and life expectancy is typically normal. Ongoing follow-up may be helpful when there are syndromic features, a family history of clefting, or repeated local symptoms.
Long-term effects
For many people, lower lip fistula has a mild long-term outlook and does not affect overall life span or general health. The main lasting issues are often small openings on the lower lip that may leak saliva or mucus, cause irritation, or be noticeable in day-to-day life. Long-term effects vary widely, especially when lower lip fistula occurs on its own versus alongside a cleft lip or cleft palate. In babies, what seem like early symptoms of lower lip fistula may later turn out to be stable lip features with few health consequences.
Small pits in the lower lip can continue to release saliva or mucus over time. This may leave the lip feeling wet, crusted, or irritated, especially in cold weather or with frequent licking.
Ongoing moisture around the openings can sometimes lead to redness, soreness, or mild swelling. Some people also have occasional blockage of the tract, which can make the area tender.
Repeated blockage or trapped secretions can occasionally lead to local infection. When this happens, the lip may become more painful, swollen, or drain thicker fluid.
Many living with lower lip fistula find the visible pits or small scars more bothersome socially than medically. Over time, this can affect confidence, especially during childhood, adolescence, or other appearance-focused stages of life.
How is it to live with Lower lip fistula?
Living with lower lip fistula is often easier than the name sounds, because many people have little to no discomfort in daily life. Some may notice small openings or pits on the lower lip that can occasionally leak saliva or mucus, which can feel bothersome, awkward, or cosmetically upsetting, especially in social situations. For many, the biggest impact is self-consciousness about appearance or the need to explain the condition to others, while family members may simply need reassurance that it is usually benign and, if troublesome, can often be treated with a minor procedure.
Treatment and drugs
Lower lip fistula is usually treated only if it causes problems, such as repeated drainage, irritation, swelling, or cosmetic concerns; many people do not need treatment if the area is small and not bothersome. When treatment is needed, the main option is a minor procedure to remove the small tract under the skin so fluid does not keep collecting or leaking. If there is redness, pain, or signs of infection, doctors may first treat that problem before surgery, and pain relief can help for a short time. Treatment often looks different for each person, especially if lower lip fistula happens on its own or as part of a broader genetic condition, so a surgeon or genetics team may help guide care. After treatment, follow-up is usually simple, with care focused on healing, watching for infection, and checking that the fistula does not come back.
Can you cure Lower lip fistula?
Yes, lower lip fistula can often be fixed with a small surgery that removes the opening and the tiny tunnel under the lip. If it is not causing any problems, treatment may not be needed, but surgery is usually the main way to stop ongoing drainage, irritation, or repeat infections.
Non-drug treatment
Lower lip fistula often has little day-to-day impact, but some people notice saliva leaking from small pits on the lower lip, irritation, or cosmetic concerns when talking, eating, or taking photos. Treatment for lower lip fistula depends on whether it causes symptoms, affects appearance, or happens alongside other differences such as cleft lip or cleft palate. Not every approach works the same way, and many living with lower lip fistula only need monitoring and simple supportive care.
If the pits are small and not causing leakage, infection, or distress, careful observation may be all that is needed. Regular follow-up helps check for irritation, swelling, or changes over time.
Gentle lip care can help if saliva from the opening causes chapping or soreness. Using a bland moisturizer and avoiding picking or squeezing the area may reduce irritation.
Good mouth care can lower the chance of debris collecting near the opening and may help limit bad taste or minor inflammation. Brushing, flossing, and routine dental visits are often part of supportive care.
Surgery is the main non-drug treatment when lower lip fistula causes ongoing drainage, repeated inflammation, or bothersome appearance. The tract is removed to prevent the opening from continuing to collect saliva or recur.
Your genes may have an impact on how drugs work for you
Lower lip fistula is a small opening or pit in the lower lip that people are born with, and this condition itself is not known to change how most medicines work in the body. For many living with lower lip fistula, treatment is often no treatment at all or a minor procedure, and there are no well-established genetic findings showing that the gene changes linked to this condition affect common medicines like pain relievers or antibiotics in a special way. In other words, genetic testing is not usually used to guide medication choices for lower lip fistula, although doctors still consider your overall health, age, and any other conditions when choosing medicine.
Pharmacological treatments
Lower lip fistula usually is not treated with medicine itself, because drugs do not close the small opening or tract. When treatment is needed, it is usually for problems around the area, such as infection, irritation, or pain, and surgery may be the main fix if symptoms keep coming back. Not everyone responds to the same medication in the same way, and many people with lower lip fistula do not need any drug treatment at all.
If a lower lip fistula becomes infected, doctors may use antibiotics such as amoxicillin-clavulanate or clindamycin to treat swelling, redness, drainage, or pain. The exact choice depends on allergy history, local prescribing practice, and how severe the infection is.
Acetaminophen or ibuprofen may help if the area is sore, inflamed, or tender after irritation or a procedure. For many, this can mean easier eating, speaking, and toothbrushing while the lip settles down.
Chlorhexidine mouth rinse may be recommended for short-term use when there is irritation inside the mouth or after a procedure near the fistula opening. This can help lower the number of bacteria in the area, but it does not remove the tract itself.
In some cases, a doctor may suggest a topical antibiotic such as mupirocin if there is mild infection or crusting at the lip opening. These treatments are used selectively and are not a standard long-term treatment for lower lip fistula.
Genetic influences
Many living with lower lip fistula want to know whether it is something that can be passed down in families. It’s natural to ask whether family history plays a role. Lower lip fistula often has a genetic link, and in some families it is inherited in an autosomal dominant pattern, which means a parent with the gene change can pass it to a child with a 50% chance. It may appear on its own, or it can be part of a broader inherited condition called Van der Woude syndrome, most often related to changes in the IRF6 gene and less often GRHL3.
Genetics do not always predict exactly how noticeable lower lip fistula will be, because relatives with the same inherited change can be affected differently. Some may have only small lip openings, while others may also have a cleft lip, cleft palate, or both. If there is a family history of lower lip fistula or related clefting, genetic counseling can help explain the chance of it happening again in future children.
Is Lower lip fistula genetic?
Genetics are very important in Lower lip fistula, which is often inherited and commonly linked to changes in the IRF6 gene. Genetic variations can affect whether Lower lip fistula appears alone or with other features, so genetic counseling may help families understand recurrence risk.
Having a genetic risk is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common in the general population. Most do not have a direct effect on health and are simply part of normal human diversity. For many genes, having a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when more than one gene and environmental factors are involved. In some situations, though, a single well-studied variant in a specific gene can be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
For many living with lower lip fistula, treatment depends less on medicine and more on whether the small openings cause saliva leakage, irritation, repeated swelling, or cosmetic concerns. Lower lip fistula often has a genetic link, and in some families it appears along with cleft lip, cleft palate, or both as part of an inherited condition called Van der Woude syndrome. Genetics is only one factor, but knowing whether lower lip fistula is part of an inherited pattern can help doctors decide if you or your child should also be checked for related mouth and facial differences and whether relatives may benefit from genetic counseling. The main treatment is usually a minor operation to remove the tract if it keeps causing problems, while medicines are mostly used only around surgery or if an infection develops. There is no standard gene-based drug choice specifically for lower lip fistula, so pharmacogenetic testing is not routinely part of treatment options for lower lip fistula. If there is a strong family history or other birth differences, a genetics visit can help guide the care plan and explain what this may mean for future children.
Interactions with other conditions
For many living with lower lip fistula, the biggest question is not the lip opening itself but whether it appears along with another condition. Lower lip fistula can occur on its own, but it is also linked with inherited conditions such as Van der Woude syndrome, where cleft lip, cleft palate, or both may happen together. Doctors call it a comorbidity when two conditions occur together. When lower lip fistula is part of a broader syndrome, some may also have missing teeth, differences in the roof of the mouth, or feeding and speech concerns, so care often involves more than one specialist. In isolated cases, lower lip fistula usually does not trigger other diseases by itself, but checking for related findings is important, especially if there is a family history or other early symptoms of lower lip fistula syndrome patterns.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Lower lip fistula?
Lower lip fistula can be mistaken for harmless lip dimples, small mucus cysts caused by a blocked saliva gland, or a minor sore or infection that leaves a tiny opening or drainage spot on the lip. Similar lip changes can also happen in some people who have a cleft lip or cleft palate, so a doctor may check for other mouth or facial differences too.
History
Many people first learn about lower lip fistula when a baby is born with two tiny dimples or openings on the lower lip, or when they notice a small drop of saliva collecting there during feeding or talking. Long before modern testing, doctors and families had already recognized this pattern as something present from birth, often causing little trouble but sometimes leading to irritation, drainage, or cosmetic concerns.
In older medical reports, these openings were described mainly by what could be seen on the lip and by the small channels beneath the surface. Initially understood only through symptoms, later they were recognized as a distinct congenital finding, now commonly called lower lip fistula or lower lip pits. Early descriptions also showed that the appearance can vary: some people have one opening, some have two, and the depth of the tract under the lip may differ from one person to another.
As medical knowledge improved, doctors began to separate lower lip fistula from other lip changes, such as simple dimples, cysts, or scars. They also realized that lower lip fistula can appear on its own or together with other birth differences, especially cleft lip or cleft palate in some families. That shift mattered, because it helped clinicians look beyond the lip itself and think about the wider health picture.
By the mid-20th century, reports of families with recurring lower lip fistula helped show that this was not just a random finding in every case. Researchers later identified a genetic cause for many affected families, which clarified why the condition may appear across generations. Even so, not everyone with lower lip fistula has the same features, and some people have only the lip findings without other related differences.
Today, the history of lower lip fistula is less about mystery and more about careful recognition. Modern care focuses on whether the pits are causing symptoms, such as repeated swelling, discharge, or infection, and whether they are part of a broader condition. Knowing this background can make early symptoms of lower lip fistula easier to spot and helps families understand why doctors may ask about relatives, feeding concerns, speech development, or a history of cleft lip and palate.