I remember reading a book about a creature that is stalking the protagonist. This creature is displayed on the cover of the book. The cover art is tan/yellow. And the creatures face is displayed on it. I wanna say I remember it looking as though its flesh was melting off. Some colors like red(muscle), blue, and yellow were beneath. Maybe even some green goo? I don’t remember much of the plot but I just have the memory of reading that book cemented in my head since childhood. I cannot for the life of me remember the name. Very vague, I know that that’s all I can recall.