HELP MOUTH PROBLEMS: this isn't exactly a TMI post but I will still put it as one.

Ok so guys this isn't to painful, (but it is somewhat) and this would have to be my second time ever getting one of these. The first time I've ever got one my mother told me it's was becus of something I ate ... and that was years ago but it just came back it's like a little bump or something at the roof of my mouth. It only hurts when acknowledged. I don't wanna go look it up and then have myself get all worried because of something that looks similar but isn't, so I usually come here for helps so if you have any thing helpful please comment. The last time i had one of these I didn't think about it, it went away on its own I just wanna know is there anything I can do to help speed up the process a little.?? Can gargling warm salt water help??