I am a 21 year old female. For the past five days I have had about 4 white bumps (not sure if its puss or fluid) on my vagina outer labia majora. Never have two at a time. They only last no more than a few hours and they are gone after I shower. I can feel when they are coming but they don't hurt more of an itch. My vagina also feels a little raw. The last time I had sex was three months ago (was my first time & protected). what could this be?