Hi, I have a small cluster of what appears to be white heads (6-8) on the shaft of my penis. Two months ago I had a blood test and urinalysis for STDs, all results came back negative. I ve been sleeping with one partner, she recently had a bladder infection and just finished her antibiotics which may have given her a yeast infection. We had sex Monday morning (1a.m) and I noticed the cluster Tuesday morning (1a.m). After we had sex Monday, I didn t practice good hygiene. I didn t take a shower until 2 o clock in the afternoon. I also work out a lot in compression shorts and wear boxer briefs. I wanted to know what this could possibly be.