Common site?
Inside the lower lip.
← All explanationsMucocele
What is a small fluid-filled swelling inside the lip?
A mucocele is a localized collection of saliva in soft tissue, often inside the lower lip. A minor salivary gland duct is commonly damaged, allowing saliva to escape into surrounding tissue. Less often, blocked drainage is involved. Similar-looking swellings need to be distinguished.
For training & practice ↓
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A small gland and duct
Minor salivary glands lie within the lip. Short ducts normally deliver their saliva to the surface.
Saliva collects
A damaged duct may allow saliva to collect beneath the lining. A swelling can rupture and refill.
Examination before intervention
Persistent or recurrent swellings need assessment. Observation or removal depends on the findings; do not puncture the swelling yourself.
At a glance
Open it yourself?
Do not puncture or cut it.
If it recurs?
Arrange an examination.
Knowledge in motion
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Silent educational film with German on-screen text and simplified teaching images. Not a patient case or a promised treatment outcome. The full English explanation is available below.
Read the film text in English
A small gland and duct
Minor salivary glands lie within the lip. Short ducts normally deliver their saliva to the surface.
Saliva collects
A damaged duct may allow saliva to collect beneath the lining. A swelling can rupture and refill.
Examination before intervention
Persistent or recurrent swellings need assessment. Observation or removal depends on the findings; do not puncture the swelling yourself.
Often confused
Leaked saliva and retention cysts
An extravasation mucocele contains saliva that has escaped into tissue. A retention cyst involves obstructed drainage; the terms are not completely interchangeable.
Quick answers
Is every lip blister a mucocele?
No. Appearance and position alone cannot reliably distinguish all oral changes.
Can it recur?
Yes, if the underlying cause persists. Recurrent swelling should be examined.
What is a ranula?
A saliva collection in the floor of the mouth is called a ranula. Its location and management may differ from a small lip mucocele.
At the practice
For a personal discussion
Editorially suggested question to discuss with Dr Niusha Barahmand Pour:
Does this finding fit a saliva collection, and is observation or further assessment appropriate?
A recurring lip swelling can be assessed directly.
Discuss a lip swellingAppointment selection at DoctolibLearning layer for training & practiceUnderstand terminology and deepen knowledge
- Extravasation
- Fluid escaping into surrounding tissue.
- Retention
- Fluid held back by impaired drainage.
- Duct
- A passage from a gland to the oral surface.
Make the distinction
An extravasation mucocele contains saliva that has escaped into tissue. A retention cyst involves obstructed drainage; the terms are not completely interchangeable.
Sources and context
Editorial research: . General information, not an individual diagnosis or treatment recommendation. Teaching illustrations are simplified and do not depict a patient case.