What is this?

ShoShortly after completing my menstrual cycle i began to itch in my vaginal area. I noticed there was one bump inside my labia. Later that bump burst and turned into an ulcer. It burned the first two days when i peed but nothing else after. Now it seems like i have some tearing in the opening of my vag. Please help.

it is very hard to tell from that photo
do you have a clearer one?