STDs :: Red Spot, Towards Bottom Of Shaft. What Is It?

On Saturday the 27th I noticed a red spot down at the bottom of my shaft on the left. Exactly one week before this on Saturday the 20th I had, had unprotected oral and vaginal sex with a girl friend of mine. I cannot be 100% sure but I do not think I achieved an orgasm and so did not ejaculate.

The red bump was a bit tender to touch, and so I finished my shower at the time and tried to ignore it. I noticed the next day on Sunday that a tiny yellow head had appeared in the middle of the spot, I do not recall it being tender by this point. On Monday a really small scab had formed as whatever it was began to heal. Doing a lot of research on the internet my biggest fear became herpes, but with this said I was hardly itchy at all and if I was at all itchy it was possibly more out of paranoia. On Wednesday I went to a clinic to get checked up, but when shining the light on my junk the nurse and I couldn't find anything! I went on to give a urine sample and take a blood test. As luck would have it, it was the stupid light because when I got home I could see the spot under normal light, and so it had not entirely cleared as I had hoped. It is now Thursday, five days since I first noticed the spot. It is still visible although now smaller and purple in colour as it continues to go down and clear.

One other thing worth noting is that about two days after having the unprotected sex I noticed a tiny red flat spot the size of a pin prick just below the bell of my circumcised penis. It faded after a couple days. Could the two possible symptoms be related? Does this sound like herpes?

I have to go back to the clinic next week to drop off a second urine sample, since chlamydia doesn't show up until 14 days after sex apparently. Show this spot not have cleared by the day before i have to drop this urine sample off, I will arrange for another one to one.