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When the inside of your mouth gets hurt or irritated, bacteria may enter and cause an infection. Sometimes you will see a painful swelling filled with pus (a thick, yellowish fluid).
If the infection is not treated, it can damage the surrounding bone and teeth. A hollow tunnel sometimes forms through the bone and skin to allow pus to drain. This tunnel is called a fistula or "sinus
tract." You might see or feel this opening inside your mouth. It looks like a pimple.
If you can see or feel a pimple-like swelling on your gum, rinse your mouth several times a day with a mild salt-water solution. Use 1/2 teaspoon of salt in 8 ounces of water. This may help draw the pus out and relieve pressure.
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Dr Neha Gupta