Ok. . I know this sounds weird. . .but it can't hurt. I had a bump. . like an abscess about 2wks ago. I don't have dental insurance right now and I was thinking. . .Grrrrreat! But. . .I did some snooping around and learned that swishing with hydrogen peroxide helps. I did, twice a day, and it's gone. . .it disappeared after about 3 days.
Still keep your dentist appt. . .I have one coming up. . .but it might be worth trying. If nothing else it might keep it from getting worse.