Noticing a sudden clear or bluish bump on your lower lip or inside your mouth can feel alarming at first. This smooth, fluid-filled swelling is most often an oral mucocele—a common, harmless cyst caused by minor damage or blockage in a small salivary gland. It may look shiny, slightly purple or pink, and feel like a soft bubble under the skin.
Mucoceles frequently appear after habits like lip biting or minor injuries, especially in younger people. They are usually painless, may change in size, and sometimes burst and refill on their own. Most occur on the inner lower lip but can also develop in other areas of the mouth.
Dentists typically recognize them easily based on appearance. In most cases, no treatment is needed, as they often heal on their own. If they persist or cause discomfort, simple procedures like removal or drainage can resolve them effectively.
Overall, despite their worrying look, oral mucoceles are benign, common, and rarely require serious medical treatment.
