I had sex with a new partner almost three weeks ago. Around the same time had a bladder infection. Just had a physical on Monday may 23. All std test came back negative. Today I found a tender little brown spot inside the tip of my penis. My doctor has me on 14 days or levaquin as he thinks that bladder infection was prostatsis. What could this little brown dot be? Is there always something like that there and I am just looking more closely!