What could a small, red, painless bump on my lip be?

A small, red, painless bump on your lip is often a mucocele, a benign, fluid-filled cyst caused by a blocked or damaged salivary gland. Mucoceles are common, harmless, and frequently resolve on their own within a few weeks.

Other possible causes include:

• Canker sores – small ulcers that heal in 1–2 weeks
• Cold sores – viral blisters from HSV-1
• Fibromas – firm bumps from repeated lip biting
• Milia – tiny keratin-filled cysts
• Oral cancer – rare, but persistent bumps should be evaluated

Because lip bumps can have many overlapping causes, identifying yours accurately matters for proper next steps. The fastest way to narrow down what's going on is to check your specific symptoms against known conditions. Take a free, instant, online symptom check to get a personalized list of possible causes and guidance on whether you should see a doctor—no signup required, and it takes just a few minutes.

Reviewed for medical accuracy: 07/15/2026