In the last few months a lump has appeared on my penis, its below the head. In feels like a vein sticking out. I am a virgin and seems to appear after i masturbate and then disapears the next day. It feels uncomfortable to masturbate when its there so im a little concerned.
Has anyone else suffered from it or knows what it is?

You should probably go see a doctor. If there is anything wrong you would want to know.