Is there an STD which presents as live or dead worms in the genitalia?

Yes, but it may not be classified as an STD. Blisters that develop that contain worms are usually from 1.) Person having sex with an animal 2.) Person having sex with a corpse (dead body). For example, if a man had sex with a dead person and the tissue began to rot and these organisms transferred to the mans genitals, a woman giving oral sex could receive these also. These blisters must be popped and the worms removed along with strong antiobotics to mitigate the infection.