Hey, this is a little embarassing but I'm not sure if I have an STD.
On the left side of my vagina on my outer labia, just next to my clitoris, is a bump. it goes from next to the top of my clitoris almost halfway down my vagina. Every now and then it gets extremely itchy, a bit sore, and it's constantly swollen and puffy. It's soft to touch, squishy even.

I shave down there every day, and I use a 3 blade razor, so I believe a razor cut is a possibility, or maybe an ingrown hair, but I have reason to believe its a lot more than that.

I have had sex with 5 guys in my life, and I will admit, I had sex with 2 of those guys when I was drunk, and we were silly enough to not use a condom. One of those guys I was with for almost one year, and I guess we felt we were ready for a kid, so, again, no condom.

I had the depo provera injection for the first time about 3 1/2 months ago, but I didn't go back for another one because I have had my period ever since I got the injection, and it still hasnt stopped.

Is this an STD, or just an ingrown hair, or something similar? :/
Please help!

Thanks guys.