The bubbling means somethings rusting underneath. you shouldnt go to the dealer they'll over charge you and dont wait till spring it will only get worse. since you said your gonna paint the car in spring/summer any ways i recommend just gettin some automotive sand paper strip the paint off till you see the rust and keep sanding till theres only metal no rust at all the just give it a couple coats of rust proof primer that should hold it over till the paint job