[Brandye]

The nylon of your knickers and using that to scratch has left you a bit raw at a micro level. Even the oil on his fingers would burn.

You most likely have a low grade vaginitis. Yeast is more common. If you are not familiar with these issues, see your doctor; if, as so many women, you have experienced this before purchase the over the counter cream for yeast and follow the directions. If it does not go away, see your doctor for the bacterial infection.