I noticed a lump/ pimple like bump on my left testicle close to the scrotum 2 days ago. I have never had one before, and I rememeber the day before I had noticed it, I trimmed my pubic hair and it was itchy so I itched it. The head of it doesnt look white, and it didnt start hurting until after I tried popping it which was unsuccessful. I am kind of nervous, what could it be?