Itching in and around the opening of the back passage (the anus) is very common & termed "pruritus
ani" in medical literature..
It is seldom due to an underlying serious condition and those who have pruritus ani are usually otherwise well.
It is a symptom with many causes, but sometimes no obvious cause can be found.
Common causes are--
**Threadworms. In children, itching around the back passage is often due to threadworms, which can cause pruritus ani in adults too. The itching is usually worse at night.
**Skin disease around the back passage. like thrush
(a Candidal yeast infection).
. Pruritus ani may be due to an allergy to something in contact with the skin, for instance to scent in toilet paper.
**Skin irritation. The skin of the bottom is sensitive and can easily be irritated by moist wipes, soaps, perfumes etc.
often makes pruritus ani worse.
in the anal area can also contribute to itching.
In any case almost all causes are nonserios & easily manageable.
Can discuss with your GP to find the exact cause & treat accordingly.
Hope you find the information useful.