I found that with a quick search for the lady that I've already told may likely have other things going on for anal itching, not just the pinworms she's focused on (and no herbals and drug treatments have helped). Candida, hemorrhoids (which she's already had surgery for in the past), and like you mentioned to me before about "toxic bile" in your father are other possibilites too..
but she's also the one who's teenage daughter was recently found to be positive for whatever Lyme coinfection they test for too.
All kinds of possibilities...gluten problems cause itching too.
It's getting to the point that with all the cleaning, cleaning, cleaning for the pinworms--it's also causing emotional/mental and marital/family problems.