A fuse blows because it's circuit is drawing more then the wiring/fuse can handle. Never install a larger fuse, as the wiring will get hot, and lead to a fire.
Did you recently replace the taillight housings, or the third brake light housing? Did you do any work on the car in or around the brake light housings?
It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.