What could cause a big white bump on my lip?

Reviewed by Yoshinori Abe, MD

Internal Medicine

A big white bump on your lip is often a mucocele, a harmless fluid-filled cyst caused by a blocked or damaged salivary gland. Other possible causes include canker sores, cold sores, milia, oral cysts, or in rare cases, oral cancer. Most mucoceles resolve on their own, but persistent, painful, or growing bumps should be evaluated by a healthcare professional.

Because lip bumps can have very different causes—ranging from minor irritation to conditions requiring treatment—it's smart to identify what you're dealing with before deciding on next steps. A free, instant, online symptom check can help you narrow down likely causes based on your specific symptoms and guide you on whether to monitor at home or see a doctor. It takes just a few minutes and could save you unnecessary worry or delay.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Large white bumps on the lip are typically mucoceles. These fluid-filled swellings occur when a minor salivary gland becomes blocked or damaged, often due to trauma like accidentally biting your lip. Mucoceles typically appear as soft, painless, bluish or clear dome-shaped bumps that can range from a few millimeters to a centimeter in size. While they sometimes resolve on their own, persistent mucoceles may need to be removed by a healthcare provider.

Other common causes of smaller white bumps or ulcers on the lips include:

Canker sores (aphthous ulcers)
Milia cysts
Fordyce spots

Each of these is generally harmless. However, if the bump changes in size, causes pain, or does not go away on its own, you can use Ubie's free AI symptom checker to better understand your symptoms and determine whether you need to see a healthcare provider for a proper evaluation.

(References)

InformedHealth.org [Internet]. Cologne, Germany: Institute for Quality and Efficiency in Health Care (IQWiG); 2006-. Overview: Canker sores (mouth ulcers) [Updated 2022 Oct 17]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK546250/
Updated 2023 Jan 31]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK560481/
Updated 2024 Jan 11]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK570596/

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