About three days ago is when I first noticed it. There was a small shiny red bump on the top lower part of the shaft of my penis. Over three days it has swelled to about the size of a bb. Today I figured it might be a pimple or something because its so spherical, so I tried to pop it, it started bleeding and now its turning purple. I'm 16 years old. Any ideas? I understand I should go to the doctor but I live in a house with just me and my mom and it would be really weird. I'll do it, but I would like to know it is necessary before I do.