2yr old, possible mouth ulcer. Treatment???

[nextphase]

Hey, DS2, recently turned 2, has a great big white spot on his tongue. Its either a mouth ulcer (Both my father and I get loads - although I've had less since I moved out of home??), or he's bitten himself, and its changed colour.

Anyway, I'd use bongella if it was me. But its not suitable for under 16s. Would bongella teething gel numb it for him? Or is it completely different stuff? Any other suggestions

Pool lad only had fruit, yoghurt and cereal at nursery today, rejected lunch and tea, so it must be bothering him

Bongela do a kids version, if you can't get that use calgel teething gel - DS aged 3 had an ulcer a couple of weeks ago - the above as the pharmacists recco

Cheers.
Actually took the afternoon off work, as shattered, as pharmacist suggested bongella teething, or ambersol, which is much better at numbing pain, so were on that. he's picked up on the food today, so hopefully on the mend.