relax, if you don't have sex you know its not anything like an STD. plus there are not STD that cause lumps and there is no ***** lip cancer...yet. it is most likely one of two things: (a) an ingrown hair. these can get real nasty and big. something infected to. and its caused from shaving. it will look like a big pimple. (b) a blocked gland. inside your lips are glands that secret fluids, sometimes they get blocked up and they feel like a bump inside your lip. they almost always go way on their own. Hope this information helps