I have a large pimple-looking "thing" on my reproductive organ?

Dude, it's a pimple. Yes, they do ooze out pus quite often, just depends on the type of pimple. Could also be a bug bite...it is summer and those things have a way of finding their way to the underwear area frequently...Man I probably have 5 bug bites (probably mosquitoes) in that area and always wear long pants except in bed. If your a virgin forget about STD's etc. Your okay