Hello Ive Been Having A Soreness/tender Feeling In Deep In

Hello ive been having a soreness/tender feeling in deep in my vagina (where you would insert tsmpon) for 2 1/2 weeks. I also noticed a round shape lump on my left labia which seems to be coming from the inside of my vagina. I have tryed monistat and was even prescribed a stronger prescription by my MD for a yeast infection, but none of that worked. It has to be something different. Any clues what this might be? Herpes? STD? Infection? Please help