A 24-year-old lady presented to an evening genitourinary (GU) clinic with a short history of vulval and anal irritation. On perianal examination, several threadworms were visible. Symptoms resolved with oral mebendazole and strict personal and environmental hygiene. Threadworm is a common and easily treatable cause of pruritis ani, yet is underreported in GU literature. If the history is suggestive, consider performing the diagnostic cellophane test and/or prescribing empirical treatment.
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