stick out like a sore thumb

/S T IH1 K AW0 T L AY0 K AH0 S AO0 R TH AH0 M/
verb
  1. 1

    Be very noticeably different, especially in a negative way; to be particularly obtrusive, conspicuous, blatant, or prominent; to attract undue attention or notice.

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Source: https://en.wiktionary.org/wiki/stick%20out%20like%20a%20sore%20thumb