My memory is interesting again, but I don’t remember many details. “Beyond Belief: Fact or Fiction” (1997 - 2002) , perhaps an episode from this TV series, but I’m not sure.
It is a movie or episode of a TV series (rather episode) from the 80s or 90s, probably made in USA. At the beginning, some guy dreams a nightmare in which he was bitten by a snake. He tells this dream to his wife or girlfriend, but then it turns out that it was sort of true after all. He lifts up his shirt, and there at the height of his hip, as it were, he has a snake bite mark (it was very strong). I think that it could be only episode of TV series from 90’s, maybe in style “Swamp Thing” or “Are you Afraid of Dark?” (or low-budget movie).
I think that it wasn’t horror movie, but something in style fantasy / mystery. Do you have any idea?