What Causes Red Spot On Penis With Blood And Pus Draining Out?

I have a red spot above my penis where my pubic hair is. I shaved probably a month ago and have noticed the area for a few weeks. It started out as a odd shaped bump and the skin was kind of purplish above it and it stayed that way for a while. And today I noticed it has turned red and developed a head like a pimple but there is a tiny bit of blood and puss draining from it. And the skin peeled off the area around it. I am 17 and I have had sex only once and it was unprotected. It was about a year ago.. Please help I am starting to get very worried about this!