Old horror movie . About mutations.

Looking for a Horror film category B in the period 1988-1993 release. Watched on VHS in my childhood.
Beginning. A woman kills a man with a spike syringe and he “dissolved”, then she lights a cigarette naked. On the background of the mansion, the name of the film is indicated in green letters.
Further in the film events in a small American town.
Middle of the movie. The family has dinner and the mother grows a big tongue because of the water and she chokes, the girl runs away from home. Out of town at the pump house lived the “bad people” they were trying to get away man got into their car and the car went in circles.
Then bed scene “a man and girl” where have guy perhaps, that the in sexual body happened and they died.
I don’t remember the ending.

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