Hello XXXXXX
Thanks for the query.
Although there are various factors which put people most at risk for anal itching  and they are
Diabetes,long standing diarrhea,profuse sweating,recent anti biotic use and chronic skin conditions like psoriasis BUT since your history of anal itching is very short,I don't think these are the causes.
I feel your cause for anal itching is over enthusiastic cleaning of your anal area.
This itching is due to irritation of skin around your anus.

Some of the most common irritants include the following: 
Perfumes, chemicals, or XXXXXXX on toilet paper can cause an allergic reaction. 

Advise for you
Try not to irritate the skin even more by scrubbing the area with soap. This will only cause more irritation and itching. Gentle cleaning with water helps the area heal.

Change to a plain, soft, unscented toilet paper. 

If toilet paper feels too abrasive, try cleaning with unscented baby wipes or cotton moistened with mineral oil. Dry with cotton afterward to remove any moisture. 

Wear loose-fitting cotton underwear that allows sweat to evaporate.

Over-the-counter medicines such as creams containing hydrocortisone 1% to be used locally but don't use it for more than 2 weeks( to avoid skin damage )

Avoid food irritants and eat a high-fiber diet.
I hope you should be alright with these measures however if you don't become alright in next 2 weeks then get yourself checked by the doctor for hemorrhoids and other causes.

Do write to me if you have something more to ask.
Best of luck.
Thanks

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Hello
Pinworms are white, parasitic worms that are about one-half inch long. While the infected person sleeps, female pinworms leave the intestinal tract and lay their eggs on the skin around the anus. The eggs are laid in a sticky, jelly-like substance that, along with the wriggling of the female pinworm, causes severe itching.

Pinworm is the most common infection in united states of XXXXXXX

Females may experience vaginal itching and irritation (vaginitis), if pinworms are near the vagina.

You can use diaper rash cream with zinc oxide and can take a antihistaminic tablet like cetrizine in night daily for 10 to 14 days.

Treatment and steps to prevent reinfection.....
1......The infected person should take the medicine orally. It is given in two doses. The second dose should be given two weeks after the first.
2......Bathe first thing in the morning to reduce egg contamination.
3......Wash hands and under the fingernails thoroughly, after using the bathroom, before eating and after changing diapers.
4.....Discourage nail biting and scratching bare anal areas to avoid re-infection.
5.....Keep fingernails trimmed very short.
6.....Infection often occurs in more than one family member. Treat all infected family members at the same time.
7......Change and wash underwear and pajamas in hot water daily.
8.....Machine-wash sheets, blankets, towels and clothing in hot water to destroy eggs. Machine-dry at high temperature.
9......Eggs are sensitive to sunlight, so open blinds in bedrooms in the daytime.
10.....     Since pinworm eggs are light and scatter easily, dust should be removed carefully from all surfaces in the home. Careful vacuuming or the use of an oiled cloth (which may be boiled or destroyed later) will help prevent the eggs from scattering.
11.....     Pinworm eggs continue to be present (excreted) in the feces of an infected person for up to a week after the treatment, so precautions should be taken to prevent reinfection by washing hands thoroughly, especially under the nails.

DIAGNOSIS is done by finding the female worm or eggs,To find it:

1....At night, the adult worms can sometimes be seen directly around the anal area or in pajamas. The worm (one-quarter to one-half inch long) is clearly visible to the naked eye. Finding a worm confirms the diagnosis.
2.....If adult worms are not visible, conduct a tape test in the morning. Apply a piece of transparent tape against the folds of skin around the anus to pick up any eggs or worms and then tested in a laboratory.

PINWORMS ARE VERY RARELY FOUND IN STOOL.
 Because bathing or a bowel movement can remove the eggs, the tape test should be done as soon as the person wakes up in the morning.

Thanks
Regards

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Hello
There is no need to take any more medications neither for you nor for your family.
You have already taken multiple doses of the medicines.
Continue the general measures outlined above.

Is your entire family having the similar problem and of same magnitude and intensity or is it only you who is having it now?
Apply local zinc oxide preparation and take Antihistaminic daily.
Thanks

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Hello
It looks you have been over enthusiastic in adopting personal hygiene.
Be gentle with your anal skin.
Avoid soap and use unscented baby swipes.
Use zinc oxide cream and Antihistaminic tablets.
I know this all is going to take some time but you have to have some patience.
Thanks

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