This is a common annoyance. The pus is from very small, minor infections and inflammation. You can help to reduce this by thorough washing/rubbing, which will help the ends of the hair protrude from the skin rather than becoming in-grown. An antibacterial gel (or similar will also help).
I personally think that's normal since ur vagina is very sensetive the bumps should go away and if it doesn't u should buy some cream hope this helped:-)