There seem to be no complete human beings in this poem. There are only bits and pieces of people: an arm here, some eyes there, maybe a couple of voices in the next room. The person whose appearance we know most about is Prufrock, and we kind of wish we hadn't learned about his bald spot or his bony arms and legs. The lack of bodies is one of the signs that might make us think the poem is set in Hell.
Although Prufrock mistrusts doctors and scientists, he acts like one when he "dissects" people in his perception.
Prufrock is more like a strange sea-creature than a man.