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Mumsnet hasn't checked the qualifications of anyone posting here. If you have medical concerns, please seek medical attention; if you think your problem could be acute, do so immediately. Even qualified doctors can't diagnose over the internet, so do bear that in mind when seeking or giving advice.
my SIL in pregnancy developed an ulcer on her leg and one on her tongue (by the end of her pregnancy the one on her tongue was the size of a 50p piece and about a cm thick and she had to have it surgically removed) - she was told that it happened to some women in pregnancy
the only reason I would think it wasn't an ulcer is because a dentist should recognise it quite quickly
it sounds like an abscess meggymoo - I had one above one of my incisors many years ago. The tooth had decay (it had been damaged, falling of a horse) and the stuff was draining out through my gum. They had to drill through the tooth to relieve the pressure - does it feel as though there is pressure there.
It could be a ranula (a kind of cyst in your mouth - not scary or sinister so don't worry). I had one and had to have it exised at the dental hospital (probably not what you want to hear). Does it ever burst? Mine used to burst and refill - gross.
Jasper's a dentist isn't she? She would know better than me.
I have recurring cysts in my mouth that go lighter in colour as they grow and fill up, have always gone away with no probs. If it hurts or you are worried perhaps worth going back for another look - or even your GP to check it out.