What to do if i have a lump on my gum that comes and goes?

See Dentist: See your Dentist. They will evaluate and determine the cause. Might refer you to a specialist for treatment. Sounds like a Phoenix abscess - comes and goes- which is periodically draining. Get treatment right away or it will only get worse. Good Luck.

See your dentist: The fistula is a sign that there is an infection and your body is draining it out through the pimple. See your dentist for diagnosis and treatment.