I'm 21 years old, and I believe I have a sabaceous cyst on the shaft of my penis. I do shave around that area every 5 weeks or so, however this has just occurred. Admittedly, I've poked about, but today I've popped it, puss came out from around 3 separate areas and now the small holes have turned a dark blood-like colour. What should I do and how should I treat it?