With a bald spot in the middle of my hair—
(They will say: “How his hair is growing thin!”)
The parenthetical line here, along with this one, further demonstrates Prufrock’s self-consciousness and lack of self-confidence.
Compare Nick Carraway’s anxiety in The Great Gatsby, a novel well-stocked with references to Eliot’s poetry:
Thirty—the promise of a decade of loneliness, a thinning list of single men to know, a thinning brief-case of enthusiasm, thinning hair.
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