Uzumaki, by Junji Ito

"Spiral into horror" with Junji Ito's masterpiece, Uzumaki.
A three volume manga series taking the simple pattern of a spiral and turning it into pure terror as it slowly takes over a town. Known for his unsettling art style and disturbing ideas, this is Junji Ito's magnum opus.

Content warnings: Intense body horror, self-mutilation, suicide, death, the undead, mental illness, obsession, trypophobia, paranoia, stalking, cannibalism, psuedo-cannibalism, natural disasters, cosmic horror, pregnancy horror, abusive parents, dead animals. But no pets die.

DM for further content warnings, list is too expansive.