need help with cyst, nodule

I need help. I have been looking for pictures online. I cant find any that look like what I have on my scrotum. I have a pea sized hard nodule. Does anybody know what it is? I tried popping it like a pimple. I broke the skin, but only blood and puss came out. there was a hair growing out of it. can this be an std? or ingrown hair or something? http://s752.photobucket.com/albums/xx167/cheersam321/?action=view¤t=p1.jpg