This time I'd like to share a clue scene I remember from a movie but cannot remember its title. The movie has something to do with some sort of possession and I just remember a scene where the "possessed" woman is kept confined inside a room, and apparently, no one’s able to enter the room and help her. In one instance, the related "entity" is shown inside the room as a small "Indian-like" creature playing some sort of drum as an apparent ritual and also, something appears to be developing and trying to emerge from inside the woman's body. Any help is strongly appreciated. ...Blessings.

What is the setting of the film?

There is a British "Hammer Horror" film, set in England in the late 1900s, in which a possessed woman turns into a creature with the head and body of a snake: "The Reptile" (1966). There is a similar scene to the one you describe. This is just one of many possibilities.

You can check it out on IMDb and there is also a video trailer. Good hunting!

Thanks for your kind & prompt response. Unfortunately, that was not the film but you've brought a new & interesting angle/theme under the same genre for me to further search about. Regarding the setting for the movie I'm trying to find, I think it is mainly focused (filmed) inside a room where the "possessed woman" is "confined" as if she were sick. I'm not totally clear if it belongs to a hospital room or a bedroom at home, but I clearly remember that the inside of the room looked like some sort of time/space limbo, where some kind of supernatural force keeps the "possessed woman" isolated while a supernatural "thing" is developing inside her. If I'm not wrong, that "thing", when fully developed, tries to forcefully emerge from its host (the woman's body) through her back. Hope this helps. I'll wait for further comments. ...Cheers.