I'm not sure if this was an episode of "Tales from the Dark Side" or "Twilight Zone" or something else from the 90s (or late 80s). The plot was a patient (transgender?) wanted to have surgery to make her look beautiful. However, as the plastic surgeon got drunk the night before the operation, his hands were shaky and the patient got disfigured.
The patient decided to get revenge though. With skillful make-up, she seduces the doctor in a bar. Once they get up a room, she removes the make-up revealing her disfigured face then slashes the doctor's face with a knife or scalpel. I remember there was then a voice-over.
Does it ring a bell?