As the boil begins to fill with more pus, made of dead cells and fluid, the area will grow. You might also notice pain worsening. Sometimes, the center of the boil will appear yellow as the pus ...

A gum boil is a type of periodontal disease that involves the formation of an abscess on the gums. It causes pain and swelling. If left untreated, it can spread to the teeth and surrounding tissues.