Police said a case has been registered at Amer police station and the body has been sent for post-mortem.
Prima facie, the woman, who looked to be in her forties, was murdered at a different location and dumped on the outskirts of the city, a police officer said.
Going by her outfit, the woman seemed to be from rural area, police said.
The body seemed to have been dumped on the highway with the face disfigured to conceal her identity, investigating officer Mukesh Kumar said.