Nightbreed

Nightbreed also Night Breed on publicity material, or Clive Barkers Nightbreed is a 1990 American dark fantasy horror film written and directed by Clive Barker, based on his 1988 novella Cabal, and starring Craig Sheffer, Anne Bobby, David Cronenberg, Charles Haid, Hugh Quarshie, and Doug Bradley. The film features an unstable mental patient who is falsely led to believe by his doctor that he is a serial killer. Tracked down by the police, his doctor, and his girlfriend Lori, Boone eventually finds refuge in an abandoned cemetery called Midian among a tribe of monsters and outcasts known as the Nightbreed where they hide from humanity.

Aaron Boone dreams of Midian, a city where monsters are accepted. At the request of girlfriend Lori Winston, Boone is seeing psychotherapist Dr. Phillip Decker, who convinces Boone that he committed a series of murders. Decker is actually a masked serial killer who has murdered several families. Decker drugs Boone with LSD disguised as lithium and orders Boone to turn himself in.Before he can, Boone is struck by a truck and taken to a hospital. There, Boone overhears the rants of Narcisse who seeks to enter Midian. Convinced that Boone is there to test him, Narcisse gives Boone directions before tearing the skin off his face. ........

Source: Wikipedia