My last sexually interaction was about 2 weeks ago. But around 3 days ago i started to have an itching sensation "down there", the day i started my period. I figured it would just go away. But today it started swelling. One side its actually swollen more than the other. I really need help..and really scared, im only 15!! Ive been searching and have had the same symptoms as an yeast infection...is that what this is??? If so is it treatable? !

Help, Please!

-Thanks