For some months I have felt a tiny (3mm) blister form and disappear on the back of my throat. The blister is white in appearance, does not appear to contain pus or anything other than a watery liquid and is not painful, merely irritating. The strange thing is that, whether left alone or scratched off, the blister always seems to reappear within a week or two, in exactly the same size and location.

Does anyone have any suggestions as to what this could be and what, if anything, I should do about it?


Thanks for your time and help,
Andrew