Hi first u identify is it a cold sore or a pimple.. Cold sores are red, fluid-filled blisters that form near the mouth or on other areas of the face. In rare cases, cold sores may appear on the fingers, nose, or inside the mouth. They are usually clumped together in patches. Cold sores may persist for two weeks or longer. cold sore goes through five stages: Stage one: Tingling and itching occurs about 24 hours before blisters erupt. Stage two: Fluid-filled blisters appear. Stage three: The blisters burst, ooze, and form painful sores. Stage four: The sores dry out and scab over causing itching and cracking. Stage five: The scab falls off and the cold sore heals.

Is it ulcer or boil on gum ur mentioning

Sorry didn't get your description...may be a small swelling before ulcer appears...kindly visit your nearby clinic

What do u mean by a button?please elaborate.