HELP: What I thought was a pimple might not be!

I'm 25, I've never had any kind of problems "down there"...

But last night, as I was getting ready for a shower, I noticed a pain... What looked like a pimple was on my scrotum. I've had pimples down there, but they were small, and didn't last long at all. This thing was big, about a cm in diameter due to swelling. It was pussing on it's own, and this disturbed me greatly. I also noticed a pain in my crotch next to my left thigh. I tried to clean it all as much as possible...

BUT, today, the sore is still there, only now more swolen than before. It almost feels like I have 3 balls all of the sudden... The sore area of my crotch next to my thigh (but above the penile area) is now red, and about 2 cm by 3 cm)... It also appears somewhat swolen...

What on earth is this?! I work 80+hrs a week, and have very little time for dr visits...

I went from completely normal to this overnight, so I'm really confused. I havn't had sex with anyone except my wife in 3 years, so I doubt it's an STD, but I won't rule that out because I havn't been her own parter...