Horror is my favorite genre and I’ve posted lots of horror movie recs on my profile so I’m gonna shake it up and say the horror manga of Junji Ito. Lots of his work is body horror or surreal horror, his whole thing is taking normal and everyday things and making them unsettling.
I recommend starting with one of his short story collections, because they’re accessible easy reads and give you the best picture of what he’s all about. But his magnum opus is Uzumaki, which is about a town terrorized by spirals; spirals in nature, spirals in man-made objects, spirals in the human body, etc. that eventually drive the whole town to madness. I’m also dying to read his adaptation of Mary Shelley’s Frankenstein.