A gum abscess is a localised infection in the gum tissue. It appears as a painful, red lump on the gums. Pressing on the area may release pus with an unpleasant taste. The pain is often throbbing and gets worse when the area is touched. With a more extensive infection there may also be facial swelling or a fever. Causes include deep tooth decay, periodontal pockets or trauma. Rinsing with warm salt water gives temporary relief. Professional treatment is needed to drain and clean the abscess. Antibiotics may be prescribed if there are systemic symptoms. Left untreated, an abscess can lead to more serious infections.
Periodontology - Symptoms and Diagnosis
How do I recognise a gum abscess?
A painful swelling, redness and sometimes a discharge of pus are the typical signs.

