What Could Vaginal Swelling With Pus Discharge Suggest?

A day after my period I developed a huge swelling right at the entry of my vagina,my left labia majoria was swollen and it hurt when touch,walk or sit. The follow day I gentle touch it and its like it burst and the a whole of pus like fluid discharges from my vagina,a whole lot. The swelling was subsided a little but the next day my labia minoria on the same side swollen alot and I was still getting that discharge. It burn a little bit when I pee and it hurt when I sit,my labia minoria itches. I don t know what is happening and wondering if u could tell by my symptoms.