This itching and discomfort in the anus region can be pruritus ani which is quite a common condition. It is usually more troublesome at night or after passing a bowel action. Excessive cleaning of the perianal area may exacerbate the problem by removing natural protective oils. Itching in the perianal area can also be associated with the presence of
a) hemorrhoids or
b) anal fissures,
c) infections or
d) skin conditions, so examination by a general surgeon and dermatologist would be prudent if below mentioned treatment are not completely effective.
Following can be helpful:
1) It is important to keep the perianal area clean but at the same time limit trauma and rough cleaning of the affected area. Thus be as gentle as possible.
2) Avoid using soap. Use QV cleanser or aqueous cream instead.
3) Minimize scratching as much as possible as it may make itching worse
4) Use a non-perfumed cornstarch powder or barrier ointment such as Bepanthen to protect the skin.
4) If moisture is a more resistant problem then consider using a male sanitary pad.
5) A mild anti-inflammatory cortisone
agent (such as Sigmacort 1% ointment or Egocort 1% cream available over the counter) is helpful in abating the symptom.
6) Dietary factors like certain foods items can be associated with anal pruritus/itching; these are: coffee, tea, cola, chocolate, tomatoes, and citrus fruits. so they should be avoided.
8) A slight fecal soilage is very important cause for the anal itching. If this is a possibility (in your age group this is not very common), sleeping with a baby pad is the answer for it. Though some physician recommend biofeedback or Kegel exercises. The best ointment and helpful measure is a 1 percent hydrocortisone cream applied twice daily with keeping it dry. That should take care of it. Give atleast 1-2 weeks for this treatment as changing the local application cream frequently would not be helpful.
Please feel free for your follow up question.