I need help😬

okay so i have blisters/cuts? on the outside of my vagina.. on the lip. i haven't had sex in literally forever(almost a year), and the last time i had oral was almost 2 months ago. what could be causing this?? the blisters are open and raw. 
UPDATE;
i'm underage. i can't go to a doctor without my mother finding out, and i promise you that i will die if mom were to find out