What Is The Treatment For Vaginal Itching And A Bump In The Anus?

hi im 17 f sexually active for the past couple days vigina itched then ive use bathroom it hurt when i pee then i noticed i had so blister or bump like things around my anal.. i use condoms and dont have anal sex but a few days ago i went to lake with tampon in and thats when i felt it itched... what could be wrong please help