Greetings.
Enterobius vermicularis (pinworm) is the most common intestinal parasite. Despite primarily living in the gut, the most common chief complaint is anal itching (pruritus). Albendazole is the drug used for its treatment.
Other causes are medications, poor hygeine, chemical irritants, food irritants, hemorrhoids, skin infection, over use of laxatives etc.
Read here detailed information on anal itching.
Hope this helps. Please feel free, if you have further questions to ask.
Dr. Arun
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