Blister on upper gum
A blister-like bump on the upper gum may be a drainage sinus from an infected tooth, a trauma-related sore, or another lesion that needs examination.
The short answer
A small pimple or blister on the upper gum can be a route for pus from an abscessed tooth, even when the toothache is mild or absent.
How can a tooth infection reach the upper gum?
The upper gum lies over the roots of the upper teeth, so infection at a tooth root can track through bone and open as a sinus tract. Other possibilities include a burn, canker-type ulcer, blocked minor salivary gland, or less common oral lesion.
What should you do about a blister on your upper gum?
Do not pop or squeeze it. Rinse gently with warm salt water for comfort, keep brushing carefully, and book an examination. The dentist may tap and test teeth, take a radiograph, and treat the source with root canal treatment, drainage, or extraction when indicated.
When is an upper gum blister an urgent concern?
Seek urgent help for spreading swelling, fever, difficulty opening the mouth, swallowing or breathing, or swelling near the eye. A bump lasting more than two weeks also needs assessment.
What should you ask about an upper gum blister?
Ask which tooth or tissue is causing the bump, whether imaging shows a root infection, and whether the tooth can be restored.
Frequently asked questions
Can an abscess drain by itself?
It may release fluid through a gum opening, but the infection source can remain and still requires dental treatment.
Is every gum blister an abscess?
No. Trauma and other mouth lesions can look similar, so appearance alone cannot establish the cause.
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Who wrote this page
This library is published by Dental Nation, a licensed dental group practising in the United Arab Emirates. Pages are written and overseen by the same clinical team that treats patients in our clinics, and are held to a fixed editorial standard for safety and accuracy.
This page is patient education, not medical advice, and cannot replace an examination. Anything urgent — facial swelling, trauma, uncontrolled bleeding or severe pain — needs a dentist or emergency care now.