Anbesol

On the box it says it's for "rapid relief from mouth ulcers", yet under 'possible side-effects' it lists "mouth ulcers". So you put it on a mouth ulcer you already have, and it gets rid of it nicely, but then, because of the Anbesol, you develop another ulcer where the old one used to be. Do you put more Anbesol on it, or will that just make it worse? Is an Anbesol induced mouth ulcer different to any other one? Do you just have to leave it to go away on its own? Because if that's the case, WHAT THE FUCK WAS THE POINT OF USING THE FUCKING ANBESOL IN THE FIRST PLACE?!