This must be very frustrating for you. I'm glad you have seen a doctor and sorry you have not found answers. In most cases anal itching, which is more common in men than women, is of no known cause. But there are some things that irritate some people this way so I will mention some, in case anything might apply to you.
Dyes, perfumes, and chemicals on toilet paper can bother some people. Food sensitivities can also be manifest in this way, the most common culprits being chocolate, beer, caffeine, nuts, dairy, and spicy foods. Genital warts might also be present, causing itching and of course, hemorrhoids. Sweating and too-tight underwear can also contribute to the problem, so you can try taking measures to eliminate these culprits. You may also consider keeping a diary of foods and other situations such as irritants to see if there is a pattern that would allow you to identify anything that is particularly bothersome for you.
In altering diet, you could eliminate the high risk foods listed here for a couple of weeks to see if it makes a difference, then try adding back only one food at a time, possibly one food in each week, then if there is a sensitivity, you might be able to identify which food is causing the problem.
You should follow up with your doctor again about the herpes since this is the most likely reason for the pain, swelling and possibly even the itching, though it could be two separate issues entirely. Treatment is available in the form of antiviral medication. Good luck.
The answers in online forums are for information only and are not intended to substitute for medical advice and care. Please see your personal health care provider for further evaluation of your individual case.
Debbie Miller, RN