Any whitish/yellowish substance coming out of one’s gum can be worrisome. Whenever there is an infection, the body fights it with white blood cells; the collection of these white blood cells, dead tissue and bacteria is what is known as ‘Pus’. In many cases, people do not know they have pus coming out of their gum (especially if the affected area is hidden) and they only become aware by the salty taste of pus they experience. Pus discharge from the gum is often caused by the infection of the gum or tooth.
When a tooth dies (pulpal necrosis), the dead tissues cause irritation of the surrounding tissues which then leads to infection of the area which could spread to the surrounding bone. Since there is no where the pus can drain to, it leads to swelling of the area and pain known as ‘abscess’. With continuous pressure of the swelling on the bone (in cases where the infection is not treated), a tunnel may form through the bone allowing the pus to drain through; this is seen as a pimple on the gum. This commonly occurs in the front teeth after hitting the tooth/teeth accidentally.
Photo credit: The dental check and health tap