Why Is There a Small Bump on My Lip?

There are various reasons you might see a small bump on your lip. One common cause is an oral mucocele. This happens when saliva gets trapped under the skin due to a clogged or injured salivary gland after a minor trauma like biting your lip. The bump is usually soft and filled with fluid. Another possibility is a cold sore (which is caused by a type of herpes virus). Herpes can start as a tiny bump that may later turn into a blister and then a sore, often with a tingling feeling at the start. In some cases, small bumps can appear as a result of acne. Although acne is more common on the face, it can sometimes affect the lip area. If you have been in contact with an irritant or allergen (like a new lip product), this could cause a bump through contact dermatitis. Most causes are mild and not serious, but if the bump changes, grows, or causes discomfort, it is a good idea to have a healthcare provider check it out. This explanation is educational and not exhaustive. It should not substitute for personalized medical advice.