lately during the day and night, the tip of my penis has been experiencing a burning sensation(but not when i pee). and today i find the source. i very very small hole(as small as a needle's point) just a little inside my urine hole has been causing the problem. and when i applied pressure, a puss like substance slowly started to come out, but eventually stop coming as i kept applying pressure(i do admit to having unprotected sex, once). someone please help me, i'm only seventeen and i'm very scared.