A pimple on the gum area of the mouth can be an indication of a dental abscess. The cause of this pimple-like inflammation is a bacterial infection. This inflammation is puss that collects at the pimple site.
The bacterial infection can be the result of either tooth decay or a broken tooth. If left untreated, an infection can spread into the jaw bone and cause complications.
Although a gum inflammation is one symptom of a tooth or dental abscess, some other signs are a fever, swelling of the jaw area, pain and bad breath. To treat this infection, a dentist may prescribe antibiotics. However, the treatment also can include having a root canal to address the main cause of the infection and to save the affected tooth.