Hellish Flesh (1977)

Dr. Medeiros is a brilliant scientist who doesn't have time for beautiful wife Raquel so she falls for Oliver, best friend of her husband, and soon they plot to kill George and inherit his fortune. Raquel throws acid on George's face, disfiguring it. As he recovers in the hospital, Raquel and Oliver spend all his money. After months in care Dr. George comes home with a plan for revenge.