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Worms are the commonest cause
of anal itch. Scratching repeatedly can cause
sores. Itchy anus can also be due to undigested food like citrus fruits, grapes, certain spices, tomatoes, certain medicines like antibiotics and laxatives and certain drinks like beer, milk, tea, or coffee. Anal fissures, hemorrhoids, threadworms can all cause anal itch. Itch can also be due to irritants like synthetic fiber, toiletries or fungal infection.