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In alio pediculum, in te ricinum non vides.
You see a louse on someone else, but not a tick on yourself.
—Petronius Arbiter

Petronius (c. 27-66 A.D.) was a Roman courtier, satirist writer, and credited with writing the Satyricon (Tales of Satyrs); a long satirical romance in prose and verse of which only parts of the 15th and 16th books, in a fragmentary state, still survive.

—Excerpts from Chambers Biographical Dictionary,
Chambers Harrap Publishers, Ltd.; Edinburg, 1997.
This entry is located in the following unit: Latin Proverbs, Mottoes, Phrases, and Words: Group I (page 2)