Gum swelling and pus
Gum swelling with pus can indicate a localized dental or periodontal abscess and needs prompt examination to locate and drain the source.
The short answer
Pus is inflammatory fluid containing immune cells, bacteria, and tissue debris. A swollen gum may form beside a decayed tooth, from infection around the root, or in a periodontal pocket beside the tooth.

What is the direct answer?
What does this question mean?
The dentist checks the gum, tooth vitality, pocket depths, tenderness, mobility, and bite, and may take a dental radiograph. Treatment targets the source through drainage, cleaning, root canal treatment, extraction, or periodontal care as indicated.
What can you do next?
Do not squeeze or puncture the swelling. Keep the area clean, rinse gently with warm salt water if comfortable, and use only medicines appropriate for your health history while arranging care.
When should you seek dental care?
Seek urgent care for spreading facial swelling, fever, chills, difficulty swallowing or breathing, marked weakness, or inability to open the mouth. A draining bump can reduce pressure without removing the infection.
What should you ask the dentist?
Ask whether the source is the tooth root, gum pocket, or trapped foreign material. Ask what procedure removes the source and whether follow-up is needed after drainage or antibiotics.
