Lump on gum, white this morning, now draining

[verbi]

Our 6 yr old had her front teeth root canaled and capped two years ago. The tooth to the immediate left of her front teeth was extracted and two teeth over from that has been root canaled and capped.

A few days ago, her right front tooth fell out on its own. Finally. After being loose for about six months. When she woke up this morning there was a white, lima bean sized lump in the gum above her extracted tooth. Painless even when touched. I had her brush her teeth and she flossed. She does brush and floss regularly.

About six hours later, the lump is much smaller and there is a smaller bump on bottom of it which looks like it may be draining clear fluid.

I looked online and didn't know whether this would be considered a mouth ulcer (we've been trapped inside due to a LOT of snow, so I've been giving the kids more citrus-y fruits than usual) or if it's the sign of an infection. Her dentist is out of the office, and I can't get anyone else to see her over the weekend. It still doesn't hurt but I'm worried. If this is an infection, is this something I should call her regular doctor and get antibiotics for?

Thank you for any help you might offer.

[PGB]

Sounds kinda similar to the infections I have had.  Sometimes they would do that and sometimes they didn't....I always had to take an antibiotic either way.  I'm just not sure if that's it, because she already pulled the tooth????  What is infected if the tooth is gone?  I'm not sure...you might want to see if you can get her an antibiotic just in case and get her regular dentist to see her Monday if they will.