Hey Happy Chick,
Sorry, I can't say this has happened with us but I would say if you are concerned then maybe try and get your DS into your GP to have a look?

The other thought I had was if you give your local dentist a call and just speak to them over the phone (if they will do that?). Or maybe go in and ask for someone to have a quick look?

Sorry, not very helpful I suppose - but good luck and I hope it's nothing serious!!