I Am the Doorway
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"I Am The Doorway" is a short horror/sci-fi story by Stephen King, published in his Night Shift collection.
This story is a crippled ex-astronaut's account of the terrifying change he undergoes after being exposed to some sort of alien mutagen during a space mission to Venus (similar to cancelled Manned Venus Flyby). The change takes the form of numerous tiny eyes that cover his hands. These eyes act as the titular "doorway" for an alien intelligence, allowing it to see into our world, which the man perceives it fears and hates intensely.
Soon, the alien presence is not only able to see through this doorway, but take control the man's shattered body, using him to commit terrible murders. In a desperate attempt to maintain his humanity, he douses his hands in kerosene and incinerates them, only to find out that once the doorway has opened, it cannot be so easily closed - now, there are eyes on his chest. He hopes that the alien presence will not realize what he is doing until after he has shot himself in the face with his shotgun.