What is the direct answer?
A blood-filled blister above a tooth is usually irritated gum tissue, but an abscess can look similar and needs examination.
What does this question mean?
Trauma, a sharp tooth edge, gum inflammation, and a draining tooth infection can produce a raised red or purple spot.
What can you do next?
Do not pop it. Rinse gently, use a soft toothbrush, and arrange an examination if it is painful, recurrent, or associated with pus, toothache, or swelling.
When should you seek dental care?
Seek urgent help for facial swelling, fever, or difficulty swallowing or breathing.
What should you ask the dentist?
Ask what is causing the finding, which examination or tests are needed, and which treatment addresses the cause.
Frequently asked questions
What is the main thing to know?
Trauma, a sharp tooth edge, gum inflammation, and a draining tooth infection can produce a raised red or purple spot.
When should I arrange care?
Seek urgent help for facial swelling, fever, or difficulty swallowing or breathing.

