Why do I have a bump on the inside of my lip?

There are a few reasons you might have a bump on the inside of your lip. One common cause is a mucocele. This happens when a salivary gland gets a little blocked, and a bubble of clear fluid forms. These bumps often appear on the lower lip and are usually soft and not painful. Another possibility is an aphthous ulcer, which you might notice as a sore that can hurt and sometimes appear after minor injuries or stress. Rarely, a bump on the lip could also be an early sign of something more serious like oral cancer, especially if it changes size, color, or texture over time. Usually, if you have a bump that doesn't cause any discomfort, it may simply be a reaction to biting your lip or another minor injury. However, if you're concerned about your symptoms, you can check your symptoms with a free online assessment to better understand what might be causing it and whether you should see a doctor.