I think Contracted would fit your needs. I just watched it on Netflix. It's mostly focused around one person, and there are some... gross... moments. Nothing too bad, and they really don't show much. The acting is under-par and the writing is pretty ridiculous in a few scenes (like, shit just doesn't work like that in a real restaurant, film writers), but the makeup is absolutely fantastic for how B-level the rest of the movie is. Not super scary or super violent, but fairly tense at times and the brief moments of genuine violence are hilariously bad. Seriously; I laughed out loud at numerous spots in this film.
edit: also, Antichrist isn't that bad, is it? People talk about that movie like it's Saw or something. Just a quick stab and a quick snip in the same five minute scene and all the "real bad" stuff is done with.