回复：回复：大家帮我看看怎么办。难以启齿，20年的痛苦

If you want to treat your anal itch topically, you can try tea tree oil. It is a very effective product for treating topical infections. Don't use it internally. You can buy a small bottle at a health food store, or order one on the web. It is an Australian product. Don't buy anything not produced in Australia.