Itchy anus can also be due to undigested food like citrus fruits, grapes, certain spices, tomatoes, certain medicines like antibiotics and
certain drinks like beer, milk, tea, or coffee. IBS, Crohn’s and food intolerance should also be looked into. If you can identify any of these triggers, maybe it will help you.
Anal fissures, hemorrhoids, threadworms can all cause anal itch. Itch can also be due to irritants like synthetic fiber, toiletries or fungal infection.