Suggest Treatment For Soreness On Vagina Due To Pant Crease

ive had sex about a week ago and everything was fine i used protection and everything however this friday that has recently past my vaginal area inside the lip area felt dry to i washed but has scrubed hard and then shaved, the next day my vaginal area was sore due to my crease of my pants. now i have little red bumps where i shaved and its very painful do you have any ideas of what is wrong?