A mucocele is a soft, painless, often bluish bump that usually appears on the inside of the lower lip, caused by saliva pooling under the surface after a small saliva gland is blocked or damaged. They are common in children and teenagers, with around nine in ten appearing on the lower lip. Most are harmless and many settle on their own, but a mucocele that keeps coming back or gets in the way may need a simple procedure to remove it.
Key takeaways
- A mucocele is a saliva-filled bump, most often on the inside of the lower lip.
- It usually follows damage to a tiny saliva gland, frequently from lip or cheek biting.
- About 89 percent of mucoceles in children are on the lower lip.
- They are not cancerous and are often painless, though they can be a nuisance.
- Many settle on their own; persistent ones are removed with a minor procedure.
Why a mucocele forms
Tiny saliva glands dot the lips, cheeks, and floor of the mouth, draining through small ducts. If a duct is blocked or, more often, damaged so that it leaks, saliva spills into the surrounding tissue and forms a small dome. The body walls it off, creating the bump you can see and feel.
The most common trigger in children is repeated lip or cheek biting, a habit that nips the little glands just under the lip. Orthodontic braces and a sharp tooth edge can do the same. Because the lower lip takes the brunt of accidental biting, that is where most mucoceles appear.
What a mucocele looks and feels like
A mucocele is usually a smooth, round, soft swelling a few millimetres across. It can look clear, bluish, or the same colour as the surrounding lip. It is typically painless, though it may feel tense if it has filled quickly. Many change size from day to day, sometimes shrinking after the child unconsciously bites or bursts it, then filling up again. A mucocele on the floor of the mouth is called a ranula and behaves a little differently.
Do they go away on their own?
Often, yes. Many small, recent mucoceles settle without any treatment over days to weeks, especially if the lip-biting that caused them eases off. Because of this, a sensible first step for a new bump is to watch it, discourage the biting habit, and give it time. A bump that persists for several weeks, keeps refilling, grows, or interferes with eating or speech is worth having checked.
How a mucocele is treated
When treatment is needed, the aim is to remove the affected gland so it cannot refill. Options include small surgical removal, marsupialisation (opening and draining a larger one), and laser techniques. In children, laser treatment is often well tolerated because it is quick and gentle, while surgical removal is a reliable way to take out the gland completely.
| Approach | What it involves | Notes |
|---|---|---|
| Watchful waiting | Monitor a new, small bump and reduce lip-biting | Many settle without treatment |
| Surgical removal | Removing the small gland under local anaesthetic | Reliable, low recurrence |
| Laser removal or vaporisation | Using a laser to remove the lesion | Quick, often well tolerated in children |
| Marsupialisation | Opening and draining a larger lesion | Sometimes used for bigger or deeper bumps |
Recurrence is possible but low after proper removal, reported at around 6 percent in children, so a bump that returns can simply be treated again. Avoid the temptation to keep bursting it at home, as this irritates the area and can make it persist.
When to see a dentist
See a dentist if a lip bump lasts more than a few weeks, keeps coming back, grows, bleeds, or gets in the way of eating and talking. A dentist can confirm it is a mucocele rather than something else, advise whether to watch or treat, and help with the underlying lip-biting habit. Any lump that looks unusual, feels hard, or does not behave like a typical mucocele should always be examined. For other soft-tissue lumps and bumps in the mouth, see our guide on eruption cysts in babies and children.
Frequently asked questions
Is a mucocele dangerous?
No. A mucocele is a benign, non-cancerous swelling. The main issues are that it can be a nuisance and may keep returning until the affected gland is removed.
Should I pop it?
It is best not to. Bursting a mucocole at home tends to make it refill and can introduce bacteria. If it is bothersome, have a dentist assess it.
Why does my child keep getting them?
Ongoing lip or cheek biting is the usual reason. Helping your child notice and ease the habit, and smoothing any sharp tooth edge or adjusting braces, reduces new mucoceles.
Will removal leave a scar?
Minor removal in the mouth usually heals very well with little or no visible scar, because the lining of the mouth heals quickly. Your dentist will explain what to expect.
Talk to the team at Lumi Dental
If your child has a lip bump that will not settle, the team at Lumi Dental can check it and advise whether to watch or treat. Lumi Dental does not list its own prices here. See our current deals, ask for a written quote, or book with a general dentist in Melrose Park. The Child Dental Benefits Schedule may help with costs for eligible children.
This article is general information only and is not a substitute for personal dental advice. Please see a dentist about your child's situation.
