^ Thanks, Janie. I think it might actually be one of those Epstein's Pearls - it's three or four tiny white bumps, it looks like a tooth erupting but more like a molar, because the bumps are in a blob rather than in a line the way a straight tooth would appear, if that makes any sense?
*phew*
I wasn't too concerned about cross-cutting, it was just the fact that it wasn't growing anywhere *near* where a tooth should - it's right down on the side of her gum, near where her lip/cheek starts, kwim?

But thanks for the Epstein's Pearl suggestion, I'm pretty sure it might be that. I'm still trying to get an appt with our regular GP (the doctor who saw her the other day isn't who we usually see and I wasn't really happy with his 'help') so I will get her to have a look and see if she can tell me more about it