Hi, I too had the itching vulva and anus. I figured it out myself that I have pin worms. I use Tea Tree oil, a few drops of it mixed with Virgin Olive-Oil (actually I use, probably too much, 3 droppers mixed in an Tea Tree oil bottle, 2 fl. oz.) After using this for 3-4 times....the itch was gone. Make sure that you are not allergic to Tea Tree Oil, and make sure that you dilute it in Virgin Olive-Oil first. Tea Tree Oil is mighty potent.
Right now I'm doing a detox & clense. The worm & flukes are starting to appear. I used Grapefruit Seed Extract, and Oil of Oregano on & off for the past two months. For the past 3 days I've done the colon clense. Tomorrow I'll do a colon detox along with the clense. For the past 2 days the worms are appearing.
Hope this helps. Skeet