I have the exact same thing... Its a small, matchstick head size bump, which is on my soft palate just beyond the hard palate. in line with the Median Raphe of the Palate.
Somedays, i dont even notice it, its as if, flattened and i just feel some unsmoothness... but sometimes, after eating spicy food sometimes, or breathing really cold dry air through my nose, i feel the bump become a bump. Its white in general.
Hope someone can tell what it is...
Its really worrying, i wonder if its a palatine tonsil lesion, or a cancer... It can't be Torus Palatinus cuz its not on the hard palate...