Blister in gum line

A blister-like bump on the gum may be an ulcer, irritated tissue, or a small gum boil that drains fluid from an infection near a tooth. Its appearance alone cannot identify the cause. A dentist examines the gum, tests nearby teeth, and may take an X-ray when a dental infection is possible.

The gum line contains gingiva around the tooth and a shallow pocket where plaque or food can collect. A “gum boil” is commonly a sinus tract, which is a pathway allowing fluid from inflammation near a tooth root to reach the surface. A clear or tender bubble can also follow biting trauma, a sharp food edge, a burn, or an aphthous ulcer.

Do not pop or squeeze it, because this can injure the tissue and spread irritation. Rinse gently with warm salt water, brush with a soft brush, and arrange an examination; avoid placing aspirin or peroxide directly on the gum. If a tooth is infected, treatment may involve drainage, root canal treatment, or removal of the tooth, depending on whether it can be restored.

Seek prompt care if the bump is painful, recurring, draining pus, or associated with tooth sensitivity, swelling, fever, or a bad taste. Urgent care is needed for facial swelling, trouble swallowing, trouble breathing, or difficulty opening the mouth. A spot that does not heal within about two weeks also needs assessment, even if it is not painful.