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Published on: 8/20/2026
A small bump inside your lip is most often a mucocele (a harmless, fluid-filled cyst caused by saliva build-up) or a minor salivary gland blockage, sometimes triggered by a tiny stone or duct injury. Common signs include:
Most lip bumps resolve on their own, but persistent, growing, or painful bumps should be evaluated by a healthcare professional to rule out infection or other conditions.
Because lip bumps can have many causes — from minor trauma to gland issues — identifying the likely reason is the first step to peace of mind and proper care. A free, instant, online symptom check can help you understand what's behind your bump, what to watch for, and whether you should see a doctor. It takes just a few minutes, requires no sign-up, and gives you personalized next steps — so you can act with confidence instead of guessing.
Reviewed for medical accuracy: 07/15/2026
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A small bump on the inside of the lip can be concerning, but understanding its common causes can help put your mind at ease. While most of these bumps are not dangerous, it's important to know what might be causing them and when to seek medical attention. Common causes of a small bump on the inside of the lip include:
(References)
Chaitanya P, Praveen D, Reddy M. Mucocele on Lower Lip: A Case Series. Indian Dermatol Online J. 2017 May-Jun;8(3):205-207. doi: 10.4103/idoj.IDOJ_151_16. PMID: 28584760; PMCID: PMC5447343.
Marano AA, Therattil PJ, Viviano SL, Datiashvili RO. A growing lesion of the lip. Eplasty. 2015 Apr 18;15:ic24. PMID: 25987947; PMCID: PMC4406233.
Suh DW, Lee EJ, Lew BL, Sim WY. Minor salivary gland sialolithiasis of the upper lip. Ann Dermatol. 2013 Nov;25(4):502-4. doi: 10.5021/ad.2013.25.4.502. Epub 2013 Nov 30. PMID: 24371404; PMCID: PMC3870225.
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